What is the name of the sci-fi movie where everyone in a future civilization was killed after a certain age?

Its a movie from the 60's or 70's I think. Its an underground civilization where everyone is young. Some guys escape and meet an old man at the surface. Thats all I remember about this movie.|||Logan's Run|||It was Logan's Run. It was this weird, futuristic society. They basically tricked everyone into getting killed when they turned 30. A guy found out what was happening and escaped with a group of people. I remember the old man, too -- they were really fascinated w/ his wrinkles, because they never saw an old person before ;-) Wow, haven't seen that movie in ages!|||I believe you're talking about Logan's Run. At age 30, members of the human race go through something called 'carousel'. If they live through it, they can live longer. If they die during it, they die. They ALWAYS die. Anyone who tries to escape 'carousel' are hunted down by lawmen called 'Sandmen"|||I was thinking about Logan's run the other day, Ironic you should mention it now.





P.s the Sandman was Logan.|||Logans Run. Soylent Green was a totally different movie!|||Logan's Run where they are all killed at 30 and turned in to Soylent Green which is the food they are all eating.|||Logan's Run|||the twilight zone||| There's more than one of them. Another was The Time Machine.