I did some checking. I was wrong. the name of the movie was Wild in the Streets. You can read a little about it and listen to the music theme from it titled, Nothing can change the shape of things to come. The story line is a little scary in light of the recent election.
Very familiar with that film, made in 1968. THat's where the (in)famous line "Never trust anyone over 30!" came from. "Seniors" were given LSD Kool-aid to keep them under control, and locked in concentration camps - hardly "retirement."