Photo: CBS

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

Voting 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 -- in age as well as in compensation. 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.

Photo: CBS

  • Johnny Galecki (Leonard Hofstadter)
    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
    4,115 votes
  • Kevin Sussman (Stuart Bloom)
    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, USA, New York
    3,483 votes
  • John Ross Bowie (Barry Kripke)
    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, New York, USA
    3,230 votes
  • Kunal Nayyar (Raj Koothrappali)
    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
    3,455 votes
  • Kaley Cuoco (Penny)
    Photo: The Big Bang Theory/CBS

    Kaley Cuoco was only 21 when she first portrayed Penny on Season 1 of The Big Bang Theory. She will be 33 when the finale airs in 2019.

    She previously appeared on such TV series as 8 Simple Rules and Charmed.

    • Age: 33
    • Birthplace: Camarillo, California, USA
    3,519 votes
  • Jim Parsons (Sheldon Cooper)
    Photo: The Big Bang Theory/CBS

    Jim Parsons was 34 when the first season of The Big Bang Theory debuted. He has aged along with Sheldon Cooper for the past 12 seasons.

    Since 2017, Parsons can be heard as the voice of the narrator in The Big Bang Theory spin-off show, Young Sheldon.

    • Age: 49
    • Birthplace: Houston, Texas, USA
    3,235 votes