No cute 20-something is looking at anyone within our age range in that way. Whether we got to experience it or not, we are all old and far removed from the era of life that involves cute 20-somethings. If she is looking at you, it may be for one of a million reasons but that is not one of them.
Depends if you’re in your 30s and it’s a 20yr gap of her being younger, that’s weird. If you’re in your 40s somewhere and she in her 20s, still weird but you don’t strike me as a super mature guy. Ask her wtf she’s looking at? Ask her “do I got an eye booger or something. Why you looking at me?”
trust me. Do it.