Do you think it's wrong for an 18 y/o to date a 28 y/o?

I don't think that there would be anything wrong with that. I feel like after age 18 gaps in age aren't as big of a deal. I would say if he has hinted toward it then I would say go for it. Just remember that he is in a different stage of life. You're getting ready to college and he's already out of school and probably has a job. I think that if you both want it to work out then you can make it work. I honestly am kind of in the same boat where the guy I like is older, and I don't see anything wrong with it. As long as you're both happy then I say go for it!