Mark-Paul Gosselaar is 17 years old, as Zack Morris, on the left; and 40 years old, as Zack again, on the right. What the heck?!?
Tiffani Thiessen was 18 (left) when she was every Saved by the Bell fan's wet dream. Over two decades later, at age 41, not much has changed.
Can you even guess which is old and which is current Mario Lopez? He's 18 on the left; 41 on the right. Amazing.
Elizabeth Berkley does not age!!!! There's a 23-year difference between these two photos of the actress.
Mark-Paul as Zack
Behind the scenes at the Tonight Show, where Mark-Paul Gosselaar reprised his character Zack Morris ... in 2015.
Mark-Paul and Tiffani
Mark-Paul Gosselaar and Tiffani Thiessen reprise their characters of Zack Morris and Tiffani Thissen ... in 2015! Yet they look the same as they always have!
Mark-Paul and Elizabeth
Mark-Paul Gosselaar and Elizabeth Berkley reprise their Saved By the Bell characters, more than 20 years later!
Elizabeth Berkley: Ageless!
Seriously, did we mention Elizabeth Berkley does not age? More than two decades after Saved By the Bell aired, she still looks the same!
Lark Voorhies did not attend Jimmy Fallon's Saved By the Bell reunion. Perhaps now we know why.
Dustin Diamond did not attend Jimmy Fallon's Tonight Show Saved By the Bell reunion for obvious reasons. You know, sex tapes and violent arrests and being an overall mess of a human being.
Remember Mr. Belding? How can you not? Here's Dennis Haskins then and now.
Saved By the Bell Reunion Pic
It wasn't the whole cast, but with the fab four and the addition of Jimmy Fallon, the Saved By the Reunion of 2015 was about as epic as it gets.
And when forever arrives, these people will still look like high school students.