Jimmy was 21, I think. And Lois was 25, I think. (I'm basing that on Clark's age of 26 and that Lois was about a year younger than him.) Also, I was thinking more of a very different Lois.
Lois was 26 in the pilot, and Jimmy wasn't 21 until 3rd season, so he was 19 in first season. Clark was born in '66, and the first season started in '93, so in the pilot he was 27.
