Dystopian Futures: Logan's Run (1976) trailer

wikipedia: Logan's Run is a movies based on science fiction novel by American writers William F. Nolan and George Clayton Johnson. Published in 1967, the novel depicts a dystopic ageist future society in which both population and the consumption of resources are maintained in equilibrium by requiring the death of everyone reaching the age of 21. The story follows the actions of Logan, a Sandman charged with enforcing the rule, as he tracks down and kills citizens who "run" from society's lethal demand—only to end up "running" himself.

Logan's Run