My sister's gone NC with me. No idea why, she's given different 'reasons' to each family member that asked. We were close. Anyway, here's the point: I expect she wanted me to be all distressed and grovel to have her back in my life, so she could give me a thorough evaluation of everything that's wrong with me and how saintly she's been to put up with me all her life.
What did happen: I asked once, have I done something? Can I put it right? Didn't get an answer. I didn't pursue it. I felt hurt ... and I also felt that, as an adult, I must respect her adult choices on the company she keeps. So that's that; I have one sister less and I accept it.
An interesting thing happens when you start seeing other people as absolutely separate individuals. It so happens that I find people endlessly fascinating, but it's the same if you don't give a toss about them. Each of the eight billion humans on this planet lives in their own personal world, unique to them alone. I'll try and explain ...
If you and I were standing next to each other in the market square this chilly afternoon and something happened - I dunno, a giraffe galloped up one of the paths, knocked over the tables outside the café and hoofed it out into the high street - we'd experience it differently. We'd agree on the giraffe event (though some wouldn't!) One of us might've been more shocked, more scared or more amused by the whole thing. You might be worried for the animal's wellbeing, I might be concerned in case it caused a traffic accident. We would each remember completely different things about what else happened in the square at that moment and how other people reacted.
So, if you feel like you know what other people are thinking about you, you're wrong. Weirdly, most of them aren't thinking about you at all 😄 A more interesting question (to me, ymmv) is what are they thinking about? What's it like inside their personal world? I can spend hours people-watching. An equally valid point of view is that everybody else's personal world is their business, so who cares?
With regards to ageing: it happened to me very fast. Years of living 'intensively' caught up with me all at once; I went from conventionally attractive to raddled within a year or so. There was an extended double-take moment while I got my head around the fact that people's responses to my appearance would change. When it comes down to it, though, there isn't much difference. Everyone's still going about their own lives and I go about mine. The fact that nobody's labelling me "pretty" these days has zero effect on my day to day.
I honestly hadn't realised this was going to be such a ramble! Sorry. It really does come down to respecting everyone's right to do their own life their way and your right to do yours. Acceptance 😎 ... and watch out for giraffes!