I relate to this in some regards. I'm kind of vain about my hair, for example. I'm intensely proud of it, on the one hand, but constantly dissatisfied with it on the other, so every morning is an exercise of "what can I do to make my hair look even better today?". The rest of me does not get nearly that level of pampering, probably because no aspect of me is as beautiful as my hair. So, coming back to the OP, I suppose I am pretty focused on preserving my beauty, when it comes to the aspects of myself that I actually find beautiful.
However... I'm not afraid of aging. Aging is honestly not on my radar right now, because I'm 22 and I believe that people are their most beautiful from their early thirties til their early forties.