26F and 18M dating?

Ok so I'm 26 and have been friends with this guy for a few months and we've gotten really close and I really like him and I think he feels the same way. But he's 18 and I kind of feel creepy if I consider the age difference. When we're together or we're talking it's not an issue and I don't think about it, and it ultimately wouldn't be a factor in a decision to date him or not, but does it seem weird to other people? Should I be concerned about it all if we're in similar life positions and get on so well?
26F and 18M dating?
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