Zoomer here, will go to concerts alone once every few months because I have pretentious taste in music + the one friend I have with very similar tastes is a little agoraphobic
Hell all 3 festivals I've been to have also been alone cause people flaking before a big fest is pretty common in general and happened to me all 3 times. Will sometimes try to meet people and hangout, sometimes not depending on what vibe I'm feeling
So many zoomers who find out I do this look at me so weird but like what, am I just not going to enjoy myself and do something I want just because I don't have somebody to go with?
I have a few friends that are 40+ and it sounds like they do stuff alone frequently. The ~30 year old friends aren't doing it a lot but they don't seem to have the same fear zoomers do either. I regularly run into 30+ yo ppl I know at an event there alone but never happens with zoomers
I think it's more a feature of being secure in oneself, which is less common being young. I remember when I was young, doing things like eating out, going to a movie etc alone seemed weird. then I did those things and it wasn't. now that I'm an old, I've traveled overseas for months at a time, explored places, moved to new states, and lived entirely on my own in new places and had to find/cultivate an entirely new social circle. it just feels like being independent.
I think in my late teens/early 20s the idea of doing all that on my own was overwhelming, whereas doing things in a little group or as part of a couple seemed much easier.
there are people my age that would find it so even now, but they are probably in the minority. being > 40 and not being capable of many doing things on your own is more the "odd" situation.