Anybody who would mock me for something like that can go fuck themselves (and hopefully enjoy that at least). I remember me and another accountant going to watch a construction crane out of the window at our work, those are so much fun to watch. The shipping guy thought it was funny that grown women were at the window watching a crane moving stuff around. But won’t most people stop to watch that?
I don’t think you are supposed to outgrow fun or enjoyment. I like all sorts of adult things too, it’s additive, I enjoy more now. I can’t think of much I’ve outgrown except for very sweet foods, that has gone in the other direction, when young I enjoyed both dark and milk chocolate, for instance, now only dark.