I have a an "ephebo" cousin, who I do a variety of things with. She acts like a kid, sounds like a kid, etc. Some of her friends look grown-ish...but being around them for 5 seconds makes it quite clear they're kids. I don't have kids so I see this through the prism of other family members, and man...I can't imagine being attracted to that.
Why would you want to date a kid, as an adult? Hell I learned firsthand that 19yos are out of my mental realm.