The Simpsons via Analogue Pocket
You had me wondering their ages and how old they were supposed to be. Apparently it's a mystery.
I am shocked the actor for George was 29. I think I always thought of them as in their 40's at the time it was on TV.
https://www.vice.com/en/article/8xpeq5/how-old-are-all-the-characters-on-seinfeld