Question: how old are the bbt characters?
Answer: 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.