Logan's Run

I saw at least part of this on t.v. a long time ago but saw the whole film now. A future utopia limits life to 30; it takes place around the time of Star Trek. The best things are some of the sets etc. for mid-1970s; less so the logic and the fairly weak ending. [The computer blows up; how will they survive in a world they never saw? Hard to handwave.] Overall fairly fun.

Update: Checking, my question is addressed in the books, especially what sounds like a rather dark sequel. Michael York (Logan) is part of the DVD commentary track.