How can looks be relative?

Some people say that looks are relative, but how can that be, when, aren't most people ATTRACTED to young (youth), symmetrical faces with good, healthy-looking bodies? ! And yes, obviously they say that equals good fertility (usually). So again, HOW is that relative? ? !

Oh and, I want to add symmetrical bodies too, like maybe even hourglass shape or certain waist to hip ratios. This, I am deducing from common sense is what the general public likes or is into! ? ! ?

And I'm not mad even though it sounds like it lol. Just being genuinely curious.

How can looks be relative?
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