Leonard is a fictional character portrayed by Jason Alexander in the TV series Malcolm in the Middle.
In the first episode they appeared in, titled Future Malcolm (season 4), they were 43 years old.
They appear in 1 episodes out of a total of 151 aired
Episodes1
Future Malcolm
episode S4.E19 may 2003Malcolm meets a chess-playing bum who could be him in 30 years; Lois can't figure out why she's gaining weight; Dewey attributes his bizarre behavior to obeying requests from the fetus Lois is carrying; Francis objects to Piama posing nude in an art class.