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How The Cast Of 'The Big Bang Theory' Aged From The First To Last Season  

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List Rules Vote up the characters who have changed the most from the first to the final season of The Big Bang Theory.

From hanging out at the apartment to working at Caltech, viewers laughed along while watching the cast of The Big Bang Theory for 12 hilarious seasons. From the first season airing in 2007 to the 12th and final season which premiered in 2018, the cast aged right along with Leonard, Sheldon, Penny, and their friends and family.

The cast of The Big Bang Theory has come a long way since the start of the series. Johnny Galecki, who portrays Leonard Hofstadter, was 32 when the show premiered in 2007. Jim Parsons, who plays Sheldon Cooper, was 34. Kaley Cuoco was 21, Simon Helberg was 27, and Kunal Nayyar was 26 when they stepped into the shoes of Penny, Howard, and Raj, respectively.

Which cast member of The Big Bang Theory do you think aged the most in 12 seasons? Take a look at the Big Bang Theory cast then and now and share your thoughts in the comments section.

Johnny Galecki is listed (or ranked) 1 on the list How The Cast Of 'The Big Bang Theory' Aged From The First To Last Season
Photo: The Big Bang Theory/CBS

Johnny Galecki has portrayed Leonard Hofstadter since the Season 1 premiere in 2007 when he was 32 years old. He has starred as the brilliant physicist for all 12 seasons of The Big Bang Theory.

Before joining the cast of The Big Bang Theory, Galecki was best known for playing David on Roseanne in the 1990s.

Age: 43

Birthplace: Bree, Belgium

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Kevin Sussman is listed (or ranked) 2 on the list How The Cast Of 'The Big Bang Theory' Aged From The First To Last Season
Photo: The Big Bang Theory/CBS

Then-38-year-old actor Kevin Sussman first portrayed Stuart Bloom on The Big Bang Theory during Season 2. He has appeared in every subsequent season.

Age: 48

Birthplace: New York City, New York, United States of America

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John Ross Bowie is listed (or ranked) 3 on the list How The Cast Of 'The Big Bang Theory' Aged From The First To Last Season
Photo: The Big Bang Theory/CBS

Then-37-year-old actor John Ross Bowie first portrayed Barry Kripke on Season 2 of The Big Bang Theory. He continued to play Sheldon's nemesis for the next 11 seasons.

Age: 47

Birthplace: New York City, New York, United States of America

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Kunal Nayyar is listed (or ranked) 4 on the list How The Cast Of 'The Big Bang Theory' Aged From The First To Last Season
Photo: The Big Bang Theory/CBS

Kunal Nayyar was 26 years old when he started his 12-year stint as Raj Koothrappali on The Big Bang Theory. Along with appearing on the hit CBS sitcom, Nayyar has also lent his voice to several popular films including Ice Age: Continental Drift and Trolls.

Age: 37

Birthplace: Hammersmith, London, United Kingdom

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