My bf thinks leggings and ugs are

What's the question? Impossible to vote from the way you've phrased it: is it yes to his views or yes to yours?

I've seen women in their 20s-40s wearing them. They're not my thing, but if someone wants to wear it and it's harmless, they can.

Tell him that you and the rest of the world can wear what they like as long as it is legal.

I've seen women in their 40s wearing uggs and leggings & get away with it.

They're for any age really honestly but it's the most tackiest look I've ever seen I actually hate it honestly when girls wear uggs and leggings. They look like fucking bums to me, my girls aren't allowed to wear them I tell them straight up don't wear that shit around me.

I wear leggings and uggs all the time!

Totally normal

If my figure would be suited to this i probably would do it but i do like my leggings and uggs separately though..
Also I'm 26

They're cute. You can be an adult and want to look cute. It doesn't mean you look childish, and "teen clothing" is either childish (think unicorn t-shirts) or more for adults.

Even if something is childish to you, if you're confident and like it, wear it. I don't want to go all "omg you go girllll" because I get people don't want to physically feel like a societal outcast.

Anyway, your question is confusing. Does yes mean I agree with you or your boyfriend?

Tell him guys like leggings and uggs on almost any woman who has a nice ass...