Logan’s Run, Nolan and Johnson. Yes. I was given this book some months ago, and finally resolved to read it. I was surprised that it wasn’t awful, though I shouldn’t have been surprised that it is superior to the movie, in at least some respects. Most notably, Logan is a more active protagonist than the movie makes him.
The history and structure of the future society are naturally more fleshed out, but there are some disappointing inconsistencies regarding what colors happen at what ages, and it’s not entirely clear that the plot holds together.  Still, what it lacks in sense, it nearly makes up in brevity.