Of course, it happens a lot in the workplace. It's not directly evident among the people I interact with at my job, but we're also relatively gender-balanced and there's an age spread.

...I think one of my big gripes with the public school system is that kids are sorted by age. When I went to Montessori school, we weren't, which meant that my girlfriends were one or two years older than me (a huge difference at that age). Accordingly, I had to be more mature. When you are surrounded almost exclusively by people your own age, there's not the same push to reach beyond your limits. Behaviours tend to get reinforced amongst peers that don't get reinforced in more diverse groupings.

If my middle-aged co-workers mocked the appearance or sexuality or whatever of the younger ones, or vice versa, it would be a bit laughable.