It's only weird if you are conflating physical beauty and sexual attractiveness. And symmetry tends to be a pretty universal physical indicator of beauty and doesn't change much from 15 onward.

Physical beauty is often an attractor of lust, but someone with no sexual hormones or sexual desire could still assess or another's beauty without a sexual component, an asexual person could, someone not sexually attracted to a given gender could still assess physical attractiveness of someone of that gender (a straight woman assessing a girl's beauty), etc.