Garbageism

Garbage.
Ageism.
Garbageism.

The gist of being ageist:
Being prejudiced against the old is odd, because if you keep it up, eventually you'll be prejudiced against yourself.

It's one of the only bigotries like that.

Homophobia is close.
It must be hard being so impassioned about gay people without succumbing to those passions eventually.

People who hate old gay people have it the worst.