How young can a kid go and dress by themselves at a gym?

When I go to the Y with my almost 3 year old daughter, we use the “Family Lockers” made for entire mixed gender families to go into little stalls and I assumed the parents would help the little ones dress. The stalls are very popular and sometimes there is a long wait.

I get a bit peeved and sort of creeped out seeing SO many mothers go in the stalls with their 12–14 year old sons. I don’t see so many mothers and daughters—just mothers and sons. I would assume at this age, the boys would go into the boys locker room, meant for kids aged 6–16. These kids are NOT disabled as far as I can tell. And a few of these kids will kick their moms out of the stalls while they dress.

To me, these kids are WAY to old to be dressing with mommy. But maybe I’d feel differently if I had older kids. I was just wondering about opinions on this.