OK, here is a question for you. How old do YOU think is too old? How long have you been a counselor? Do you enjoy it? Are you good at it? Do you get paid well? Will you wind up being a camp director? Do you have something better to do? Is someone on your case? Why are you asking?
When you try joining a conversation and everyone gets queit and start looking over their shulders thats a sure sign that you are no longer one of them…
I think the OPs question is, if a boy is say, 25 and still not in a meaningful job (or married) is there a concern that he should not be among young campers?
I’d say, yeah.
(No idea about girls camps, so no comment about that.)