@boomerang,
I love the Overly Polite English Girls!
jcboy, I give out candy to pretty much anyone, we were running low though (like Boomer, I thought I had way too much and was surprised at how many people came out in the rain and cold -- however, it was almost all local people this year, which was nice, we often have "tourists" who just grab and leave, I prefer the chattier locals)... um, lost that sentence. OK, so we were running low so when we got a group of oder teenagers (college students I think) I was a little stern about just one per person, but they were about the last ones of the evening so it ended up fine.
But I consider age more of a cut-off than costume-wearing. A few kids had pretty minimal costumes.
The tiny people always slay me, toddlers in costumes are way too cute pretty much no matter what.