When I took the kids trick or treating there was one house with a fire pit that was offering candy, Pokemon cards or beer depending on the age and preference of the trick or treater

i think it's dependent by area. if you're in an area/neighborhood with mostly younger people in their 20s or such and few families, its acceptable to go out as a younger person thats around that age. but if your area is mostly families and you're going out trick or treating as a 20 year old, that's pretty strange.

Your sister is having fun and like you say, each to their own. I'd do it definitely especially together with my daughter.

Sometime when I was 13 or 14, I stopped. For one year. (I thought I had outgrown it, and was too old for “kid stuff”.) The next year my friends and I ended up putting on our costumes and trick or treating “ironically”. If anyone judged us, that was their problem. They missed out on free candy and a license to be stupid. We had a great time!

I allow it if it's a parent or sibling accompanying a child. Or if they have an amazing costume. If it's a grown ass man wearing a trash bag or a $3 mask not so much.

Shouldn't be one. I don't give a shit if you're 65 years old, if you knock you can have some candy. It's a holiday, for fun, I don't need to turn it into another fucking ethics test. I just want to have fun and I want others to have fun.

If you're looking out for your kid/brother for safety, no limits. Otherwise, 16.

Hmm I guess in my mind it's when you have a job that pays you well enough to have fun money and buy your own candy.

So age isn't even a factor.

If you still “let” them apparently they are young enough

You are asking this on Lemmy? Many of us go to conventions just hoping to see a glimpse of a 23yr old in a costume.

I'm fairly old and don't have kids and have never lived anywhere (as an adult) that had trick or treating. Based on my childhood memories of participating, I think having more older kids and young adults as, essentially, guardians, would be great. The parent to kids ratio was not great 30+ years ago. Just don't send out 23 year old creepers.