Is it that one's face gets thinner, even if one gets fatter, as one ages?
I have a scarred upper lip. The result of being hit accidentally in the face by a perfectly pleasant, but quite beefy (not in the overweight sense, just tall and muscular) German girl called Leonarda Swirskis (I may not have the spelling right and I rather hope I don't in case she ever Googles herself) wielding a hockey stick. I was 14 at the time, I think, and I never engaged in a game of hockey again. I avoided the action. Fortunately, it missed my teeth, but I can still feel the scar on the inside of my lip, but until recently it was not visible to the outside world. Well, it was if you knew it was there, but no-one did.
Twice recently, I have looked in the mirror (always a mistake) and seen it. As a line extending through and above the lip. This is a precursor of a DBM which is the sorriest manifestation of female old age. Well, apart from incontinence.