I usually listen to it loud, if it's ones I bought, they sometimes are too loud on max, but if I'm on one of those Youtube music apps then I usually have it as high as it goes, since some of the videos aren't overly loud
I used to play my music at the highest volume when I was like 13/14, but now the loudest I'll go is like 75%, and that's only when it's loud around me and I need to cancel out the noise. Otherwise, I stay fairly quiet...just enough to hear it well.
Depends on what mood I'm in really, sometimes I'll have it really loud if I'm exercising or something, if I'm not in an especially good mood I'll juts have it quiet
If I'm outside or on public transport or something I put it on quite low so that I can hear what else is going on but if I'm in a familiar environment yeah sure I'll blast it out.