I'm sorry I don't have an answer, but I can explain why I don't feel bothered about losing my looks if that's any help.
I got my first grey hair at 23, and whilst I made the obligatory objections I never really "felt" that feeling if you know what I mean? The same with noticing my first wrinkles, I felt like I should be more devastated than I actually was. As the grey hairs overtook me in my late twenties I used to dye my hair, but more out of fitting in with social expectations rather than because I wanted to.
I had a revelation about make up at around 20 when I realised that if I hadn't had time to put make up on in the morning I spent all day thinking how terrible I looked every time I passed a mirror. Then I looked at myself objectively and realised that, actually I was 20, in the prime of life and blessed with reasonable looks. Instead of making myself feel better by wearing make up I was just making myself feel worse about how I looked naturally.
When I had my children I never felt particularly bad about my post-birth body, and I'm not exaggerating when I say my body is wrecked
I'm covered in the worst stretch marks imaginable with a belly overhang that only surgery could fix. I always felt when I looked in the mirror at my stomach that they were my reminder of bringing my babies into the world and therefore something to be proud of.
If ever I have a moment of doubt I just remember how I feel when I look at my husband's wrinkles and realise they weren't there ten years ago. I can't explain the logic behind the feeling but I just want to kiss them.
I think what's helped over the years is that my husband has very similar views to myself and doesn't place much value on physical attractiveness.
There is also a reason that this feeling has been cemented over recent years and that is that I've been disabled through back problems for the last four years. I can't walk without a stick and I'm well aware that this is the first thing anyone will ever notice about me, and the thing that will stay in their minds afterwards. In a way, I've got a get out of jail free card as far as looks go, I'll always be "the lady with the walking stick/mobility scooter" and after that physical characteristic nothing else really seems to matter.
I think that all signs of ageing are best embraced. You can't change them without a great deal of effort and even if you try to fight it one day we'll all be incontinent old prunes in a nursing home together 
I'm 37 in case you were wondering. I definitely look much older though!