a few Robins who are only in their twenties. And really, I can't picture an adult
Zoe, but that doesn't mean they don't exist or that it's somehow wrong to name a girl
Zoe because while cute as a child, won't "age well". The little
Robin you can't picture would eventually be a thirty-something
Robin. (This is one argument against a name I really don't get.)
I think it's more dated for a boy, myself, because of the Batman associations. Funny how different things stick in people's minds.