I got hit on and said "Ew!" To a 16 year old

I had just worked a hard 14 hour shift so my brain was mush. I usually work in the morning with all adults but had to cover the night shift.

At the end of it, one of the 16 year olds asked me for my number and I looked at him and said "HAHA EW!" And I realized what I said, I meant to say it in my head, and I said "oh! I meant your age is ew! I am 25 years old!" And he said "no you're not." I said "no really. I am 25 years old would you like to see my ID?" And he said "I really didn't expect that." And I said "yeah nobody does." And he was like "I really thought you were about 17. That explains why you didn't need as much training." And walked off. And I said "I really didn't mean to say "ew!" At you man. You're just way too young! I'm sure you get it." And he started laughing at said "it's cool dude."

BUT I STILL FELT BAD I TOLD THIS LITTLE DUDE HE WAS "EW!" Yikes that was so mean