And can slightly change how one does and says things, which others can notice, -- to some small extent, can become a self fulfilling prophecy.

(And this can work on in a good way too -- if you say to yourself maybe: I like these people, I like most people, what matters is not age, but if the others are curious and want to learn new things)

Now, of course I do believe that ageism is a thing, still, I'd think there're somewhat many good workplaces that aren't much affected by it