While I was getting my hand "nursed' on Monday I was checking out the free On Demand movies. They always have some weird old shit on there. I stumbled across a 1970 Roger Corman flick called Gas-s-s-s.
The Military develops a nerve gas that ends up leaking out and killing everyone in the world over the age of 25. It's kinda like the Partridge Family meets Road Warrior with the occasional Roger Corman boobie shot.