While I do think AE’s demographic skews young, I will say that anecdotally i know many women, including myself, in my age range (late 30’s) who wear their bras. Lots of people I know like their undies as well. I personally am very attached to my cotton hipsters from the Gap, so I haven’t tried Aerie underwear. The selection is MUCH better (and comes in many more sizes) online. I do wish they carried a more inclusive size range in store but I also understand the necessity to deal with limited display space and to cater to the population who actually come into the stores. I think they’re doing a pretty good job given those constraints.
I actually like the more youthful aesthetic when it comes to lingerie anyway. In my size (34dd) and age range most of the stuff that’s “marketed” to me is frankly too built up and supportive. I like things like Demi bras and bralettes, which are generally considered “younger” styles.