>>7362I'm also tall and athletic with wide hips and shoulders like OP and skirts like that look perfect on me so I second the suggestion. They draw attention to your waist which gives a nice feminine look and the flare out around your wide hips also looks nice and balances out large shoulders. They go well with dainty flats or even low boots, blouses or simple girly shirts, and cardigans, so they're all-around a good staple item if you want to look more feminine but don't suit the super cutesy uguu style. Add some cute jewelry and you're set.
As for makeup being aging, OP since you mentioned kpop, have you tried Korean inspired makeup where everything is softened and more natural/muted colors? Like blended brown liner, brown and pink tone eyeshadow, light blush and maybe a tiny bit of lip color, those things usually don't age people the way more noticeable makeup does.