1 / 10
This hilarious cast played high school teenagers in the throes of puberty but in reality, they were all adults (except one!). Check out how old each cast member was when they first joined the show!
2 / 10
The main couple of the series was played by 20-year-old Topher Grace and 18-year-old Laura Prepon. The actors beautifully played awkward and goofy "Eric and Donna" in the throes of teenage hormones.
3 / 10
Danny Masterson was a whopping 22-years-old when they first started filming for the series. He played a high school student so well and was the oldest actor playing the teenage cast!
4 / 10
Hilarious "Fez" was played by 18-year-old Wilmer Valderrama. Boy could he move!
5 / 10
Ashton Kutcher was 20 when he joined the cast and his on-screen old brother Luke Wilson was 27 when he joined.
6 / 10
Mila Kunis was actually the youngest member of the cast and had allegedly lied about her age to land the part! She was 15-years-old when she starred on the show and portrayed a 15-year-old! How perfect!
7 / 10
Bully big sister "Laurie" was played by 28-year-old Lisa Robin Kelly.
8 / 10
Debra Jo Rupp was 47 when she started portraying "Eric's" hilariously loving mom "Kitty." Her onscreen husband Kurtwood Smith a.k.a. terrifying "Red" was 55 when he first starred on the hit show.
9 / 10
"Hey there, hi there, ho there!" Don Stark was 44 when he first joined his neighbors as "Bob Pinciotti!"
10 / 10
"Bob's" adorable and ditzy bombshell wife "Midge" was first played by the late Tanya Roberts when she was 43-years-old when joined the goofy cast.
The cast of the hilarious series were almost all full-grown adults when they perfectly slipped into the roles of the goofy teenagers.
From lanky and awkward "Eric" to candy-obsessed exchange student "Fez," find out how old each actor was when they joined the cast!
Only one cast member was actually the age of their teenage character! Can you guess which one?