This is something I run into sometimes, as I'm 15 years old currently and a moderator on a SE site. Sometimes, people will doubt my abilities, especially online, when they become aware of my age (although people generally seem to think that I'm older, based on my writing style).
It goes something like this:
> **Me:** *\*mentions something about doing something IRL*\*
**Other person**: Wait, how old are you? Isn't that like for kids?
**Me**: Well... I *am* fifteen.
**Other person**: Wait, really? Are you sure that you can do this? I'm not sure if I trust a teenager to b…