It is only because we let others dehumanize is this way. In fact we do that all the time by setting up institutions with built in hidden ageism. Both ways. We

It is only because we let others dehumanize is this way. In fact we do that all the time by setting up institutions with built in hidden ageism. Both ways. We set up stereotypes and expectations which while generally accurate (when tuned, and they take a long time to tune), are not accurate in particular. People mature at very different rates after all. The main sociobiological difference over time is conservatism and reflex, which are not set in stone either.