The book, now on Kindle cheap. You may not remember the movie, but if you do, you probably want the book.
Logan’s Run: Vintage Movie Classics (A Vintage Movie Classic) by William Nolan
The bestselling dystopian novel that inspired the 1970s science-fiction classic starring Michael York, Jenny Agutter, and Richard Jordan.
In 2116, it is against the law to live beyond the age of twenty-one years. When the crystal flower in the palm of your hand turns from red to black, you have reached your Lastday and you must report to a Sleepshop for processing. But the human will to survive is strong—stronger than any mere law.
Logan 3 is a Sandman, an enforcer who hunts down those Runners who refuse to accept Deep Sleep. The day before Logan’s palmflower shifts to black, a Runner accidentally reveals that he was racing toward a goal: Sanctuary. With this information driving him forward, Logan 3 assumes the role of the hunted and becomes a Runner.