They actually don't say anything, but they do say that he's a few years older than Clark.
If this is referring to the Superman movie made in 1978- that would be Otis played by Ned Beatty.
As a teenager, Lex Luthor invented a kryptonite antidote to cure Superboy of kryptonite poisoning, but he had an accident in his lab and caused fumes to escape. Superboy used his super breath to...
He has not ever died in any of the films that have been made so far.
Kevin Spacey.