It's hard to believe that the 1990s were now almost two decades ago. They were a much simpler time when Friends was the best thing on TV and before the internet had opened the world up to a new way of watching and streaming television shows, which changed the way TV has been watched over the past few years.

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These 90s sitcoms have stayed with many fans over the past few years and it seems that over the past few years a number of these stars have aged so well that it's like no time has gone by at all, but there are others who haven't aged so well and they look like they remember every year of the past two decades.

The ageing process affects us all at some point, but it seems that these celebrities have either been able to avoid it completely or have completely embraced it. It seems that the latter wasn't the best of ideas with the internet now making it so that there is nowhere to hide from camera phones or the downfalls of social media.

The following list looks at just 10 of our favourite 90s sitcom stars who have aged over the past two decades and they definitely look that way. It also looks at 10 other stars who have seemingly been dipped into the fountain of youth and it's left them looking younger than many of their fans are led to believe they are.

Looks Great: Mila Kunis

Mila Kunis is one of the biggest stars in the acting business right now, but it seems that she is another star who rose to fame in a 1990s sitcom. Kunis landed the role of Jackie Burkhart in That 70's Show when she was just 15-years-old. The show ran for eight seasons and this was where Kunis originally worked alongside her future husband Aston Kutcher.

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Kunis then went on to voice Meg in Family Guy and appear in a number of high profile movies and TV shows over the past few years, but it seems that when it comes to ageing, she has definitely hit the jackpot. Kunis is just 34 years old, but she looks absolutely stunning; it's hard to believe that she was even born in the 1990s, let alone a star of one of the decades biggest shows. Mila has definitely found her feet in recent years.

Aged Badly: Nate Richert

Nate will probably be best remembered for his role as Harvey Kinkle in Sabrina The Teenage Witch. Harvey was the long-term boyfriend of Sabrina who managed to find a place in the hearts of many fans of the show. It's been more than 15 years since the show officially came to an end back in 2003 and Harvey has changed a lot since then.

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Nate posted a picture of himself on Twitter a few years ago that showed the former heartthrob's chiselled good looks were no longer a thing. He looks unrecognizable from the star that was once the one that many fans rooted for when it came to winning the famous witch's heart. Nate was just 18 years old when he earned the role in the popular 90s show, but now at 39 years old, it seems that his days of being seen as a heartthrob are definitely far behind him.

Looks Great: Eliza Dushku

Eliza Dushku has been active around the acting circuit over the past two decades, but her most memorable role will always be as Faith on Buffy The Vampire Slayer. Faith was also a slayer alongside Buffy and it seems that her character changed the landscape of the show since she was seen as the opposite to main star Sarah Michelle Gellar.

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Buffy was one of the biggest series of the decade, but it came to an end back in 2003. Dushku was just 18 when she landed the role of Faith in Buffy back in 1998 but after the show came to an end she seemingly branched out into a number of other high profile acting roles. Even though Eliza is now 37 years old and couldn't pass for the teenage slayer Faith anymore, she seems to have been able to retain the stunning good looks that made her a star back then.

Aged Badly: Lark Voorhies

Lark will perhaps best be remembered for her role as Lisa Marie Turtle on Saved By The Bell back in the early 1990s. Lark was just 15 when she was first cast in the high-profile role and held this down until 1993 when she decided to move on to other roles within the industry.

It seems that many of the child stars of Saved By The Bell were opened up to worldwide fame, which helped Lark land a number of roles after the show came to an end. The actress decided to walk away from her career back in 2010 and has since written three books, all of which were self-published. Of course, at 43 years old Lark is a shadow of her former self and completely unrecognizable from the star of the teen show from the early 1990s, which is perhaps expected 25 years after the show came to an end.

Looks Great: Tiffani Thiessen

Unlike her Saved By The Bell co-star, it seems that Tiffani has remained just as stunning over the past few decades. Many fans of the show tuned in just to watch the beautiful teen star's portrayal of Kelly Kapowski until this came to an end in 1993.

Thiessen was seen as a teen idol in the 1990s following her tenure on Saved By The Bell before she then went on to appear in Beverley Hills 90210. Being such a high-profile star throughout the 1990s has obviously encouraged Tiffani to look after herself to the point that even at 44 years old she looks half her age. She has continued her acting career throughout the past few decades and it seems that being active has definitely worked well for her. Even though Kelly was just a teenager when she rose to fame as a cheerleader on the show, she looks more stunning now than she did back then.

Aged Badly: Jaleel White

Jaleel White played Steve Urkel on the show Family Matters, a show that he was cast in back in 1989 when he was just 13 years old. It seems that White grew up and went through the worst parts of his life while he was still on-screen before the show came to an end back in 1998 when he was 22 years old.

Like many other 90s stars, Jaleel has remained around the world of acting but many fans are unaware that he was that cute little boy on Family Matters just a few short decades ago. It seems that White has definitely aged much quicker than anyone thought that he would. From the 22-year-old at the end of the show back in 1998, he has now become a completely different looking person at 41 years old. Of course, age has to hit everyone at some point, but it seems that it hit Jaleel quite hard.

Look Great: Tia And Tamera Mowry

Who can't remember the two adorable sisters who were first spotted in Sister, Sister? Tia and her identical sister Tamera have been joined together on TV for most of their career ever since they were cast in the sitcom together back in 1994 when they were just 16 years old. As child stars, the two sisters grew up in front of the TV cameras but have still managed to age like fine wine.

The twins have continued to act since the end of the show back in 1999 and incredibly they turn 40 years old this year and still look absolutely stunning. Both Tia and Tamera have been active on TV over the past few years, opting for TV series work rather than films, and it seems that the decisions that they have made over the past few years have worked out for them since they both look absolutely incredible for their age.

Aged Badly: Sarah Michelle Gellar

Sarah Michelle Gellar has become one of the most iconic stars of the 1990s following her role as Buffy The Vampire Slayer, in a series that is still being repeated on TV to this day almost two decades after it officially came to an end.

Sarah Michelle Gellar has landed a number of high-profile acting roles ever since her slaying days come to an end and has even managed to settle down with Scooby Doo co-star Freddie Prinze Jr. and become a mother to two children. Gellar will always be seen as an icon because of her incredible portrayal of Buffy, but like many other stars, Sarah is now 40 years old and it seems that at some point age has to catch up to everyone and finally it's Sarah's turn who is finally beginning to look her age. After all, she was just 20 years old when she landed the biggest role of her career.

Looks Great: Mayim Bialik

Mayim Bialik will perhaps now be best known for her role as Amy Farrah Fowler in The Big Bang Theory. This isn't the first time that Mayim has been cast on a sitcom, though, since she was seen as the title character on 1990s sitcom Blossom when she was just 15 years old.

Mayim appeared alongside her Big Bang Theory co-star Johnny Galecki in the show and it seems that they have come full circle with their appearances on the sci-fi orientated show in recent years. Mayim was once seen as one of the best stars of that era but it seems that she has grown up to look a little different to what many fans thought she would. The neuroscientist has her own theories when it comes to her health and wellbeing and it seems that they have had a knock-on effect when it comes to her physical appearance at 42 years old.

Aged Badly: Andrew Keegan

Andrew Keegan was incredibly popular in the 1990s thanks to his roles in Party of Five and 7th Heaven. Keegan was popular because of how attractive he was and had his own fair share of female followers, even after his role in teen comedy 10 Things I Hate About You, where he played the quintessential bad guy.

He was just 17 when he landed his biggest television role of Wilson West in 7th Heaven before he later went on to become a recurring character in Party of Five. Even though he has remained on the acting circuit over the past two decades, it seems that he hasn't aged as well as his fans expected. At 39 years old, it seems that Andrew has definitely grown out of those teenage good looks that opened him up to fame. It's hard to believe that the two men above are the same person.

Looks Great: Melissa Joan Hart

Melissa Joan Hart was the woman that every teenager wanted to be in the 1990s since she was Sabrina The Teenage Witch. She had a cute boyfriend and magical powers that helped her to fix many of the issues in her life, and it seems that a little bit of that magic could have been helping Melissa to remain youthful over the past few years.

Melissa has been most recently seen alongside Joey Lawrence in Melissa and Joey where it seems that the actress has hardly even aged since the show came to an end. Some stars are obviously much luckier than others, but Hart is 41 years old and could easily go back and play a teenager once again since she still looks so young. It's incredible to think that Melissa was 23 years old when she was cast to play a teenager back in 1999, which could be why she looks so young right now.

Aged Badly: Mark-Paul Gosselaar

Zack Morris was one of the biggest stars of Saved By The Bell in the early 1990s and was the main reason why a number of teenage girls tuned into the show and helped it to become iconic. Gosselaar was just 15 years old when he was cast as the star on the show in 1989 and it seems that he went on to grow into the role in the years that followed before it came to an end just four years later.

Gosselaar's career hasn't been as successful as many of his co-stars over the past few decades, and it seems that has had an effect on the once heartthrob who has completely changed over the past few years, to the point where he is now not recognizable as Zack Morris anymore. It seems that Mark is another star that the years have not been kind to, since he is definitely showing all 44 years of his age.

Looks Great: Jenna Leigh Green

Who can forget one of the best bad girls of the 1990s, Libby Chessler? The spoiled cheerleader was one of the stars who would delight in bullying Sabrina throughout the show centred around the magical witch and it seems that this was one of the things that gave the show a sense of realism and made Sabrina The Teenage Witch so popular.

Green was 19 years old when she landed the role as the high school bully and became one of the most disliked characters of that era before she left the show back in 1999. She has since remained in the acting world and continued to work on a number of TV shows with her most recent being a small role on Quantico last year. It seems that there was definitely something magical about that TV show since almost two years later, Green still looks like she could pass for a snobby cheerleader.

Aged Badly: Sara Gilbert

Sara Gilbert was just 13 years old when she landed the role of Darlene in Roseanne back in 1988. Gilbert became a star on the show over the next decade and someone that many fans turned into watch until the show came to an end back in 1997. Since then Gilbert has continued to act and will now be most recognizable as Lesley Winkle from The Big Bang Theory. 

Much like Mayim, Gilbert and Johnny Galecki also shared the screen in the 1990s as part of Roseanne and have since been able to work together once again on The Big Bang Theory. It has been more than two decades since Roseanne came to an end and it seems that they have been a long few years for Gilbert, who looks so much older than her age of 43. The star has been in the spotlight now for 30 years and it seems that growing up in the spotlight has a number of downfalls.

Aged Well: Jennifer Aniston

Friends was the biggest show of the 1990s and it made stars out of the six main stars of the show. Of course, Jennifer Aniston was the most successful of the stars of the show and was already being cast in films when she was still appearing as Rachel Green on the popular show.

The show became so popular that each member of the cast was earning around $1 million an episode during the height of its run, but Aniston wanted to leave the show before it actually came to an end and was seemingly one of the reasons why the show ended with just ten seasons. Over the past few decades, Aniston has continued to star in some of the biggest films in Hollywood and has continued to look absolutely stunning while doing it. It's hard to believe that Aniston is 49 years old, as she doesn't look a day over 30.

Aged Badly: Raven Symone

Raven Symone was just four years old when she was cast as Olivia Kendall on The Cosby Show. She was one of the cutest child stars of all time and later went on to become a Disney Channel star in That's So Raven as well as one of The Cheetah Girls when it seems that the company realized that Raven could both act and sing.

She has become quite a controversial figure over the past few years, which could be why many fans have distanced themselves from her opinions and she has not been seen in many acting roles in recent years. At 32 years old, it seems that Raven has grown up before our very eyes and maybe the stress of this is the reason why she has grown up the way that she has. It's easy to see that she is still Raven, but it's her personality right now that has become the most unrecognizable thing about her.

Looks Great: Tahj Mowry

It seems that identical sisters Tia and Tamera Mowry who were mentioned much earlier in the article had a younger brother who also decided to step into the acting world at a young age. At just five years old Tahj was cast in Full House as Teddy, a gig that lasted for 14 episodes for the star, who has decided to continue to pursue this career alongside his sisters.

The youngest was even able to work alongside his family members in Sister, Sister back in 1994 until 1997, and has since had a number of cameo roles in some of the biggest TV shows of the past few years. Most recently he has become known as Tucker Dobbs in comedy series Baby Daddy, where he has proved that he has definitely grown up into quite the attractive man and his comedy timing is still as on point as it ever was.

Aged Badly: Martin Lawrence

Martin Lawrence was in his late 20s when he landed the lead role in TV show Martin, which ran from 1992 until 1997. Martin became a household name because of the role, which led to other high profile roles like Big Momma's House and its many sequels as well as Bad Boys.

Martin is now 52 years old and is quite well-known as a comedian, but it seems that he isn't the fresh-faced star that he once was she was able to perform some of his own stunts. Age has hit Lawrence quite hard and has led to him looking like a shadow of the man who was once the main star of a sitcom that was completely based around him. Lawrence's acting credits in recent years have been few and far between as it seems that the star could be looking to walk away from the business in the near future.

Aged Badly: Matthew Perry

While it's been an absolutely fantastic 15 years for Jennifer Aniston since Friends came to an end, it seems that it's been a different story for Matthew Perry who played Chandler Bing in the long-running show. Perry's acting jobs have been few and far between over the past few years and he has aged quite badly in recent years as well.

Incredibly, Perry is a year younger than Aniston but he looks much older than his co-star. The once popular TV star has been used mostly for cameo appearances on TV shows over the past few years as it seems that he has been unable to find his feet since Friends came to an end back in 2003. Perry's issues throughout the filming of Friends became public knowledge and could have had an impact on the rest of his career.

Looks Great: Jonathan Taylor Thomas

Jonathan Taylor Thomas was definitely on the walls of a number of teenage girls throughout the 1990s thanks to his role in Home Improvement, but it seems that the star had his taste of the acting lifestyle not long afterwards since he decided to leave the spotlight to concentrate on his studies.

Taylor landed the role when he was just 10 years old and left when he was 18 back in 1998 so that he could at least have a shot at a decent education, but it seems that he has since returned to the job where he found fame in the 1990s looking completely different. Taylor most recently appeared in Last Man Standing where he showed off a completely different look, which actually works for him. At 36 years old, it seems that a change of image was a great idea for the former child star so he could be taken seriously moving forward.

NEXT: '90s Stars Who Are Jerks And Those Who Are Sweethearts