Just found this post and really relate to it.
Similar age to you and am in poor health so I feel like I've aged even quicker than I might have otherwise, yet I somehow still seem to get threated as if I'm young (as in immature, presumably, and incompetent, not as in I look good!). Feels like I have the worst of both worlds. I've put on a LOT of weight, most annoyingly on my face, my hair has gone shit, I have terrible permanent bags under my eyes
... Etc etc. And I can't lose that weight because my health doesn't allow me to really exercise.
Any time I try dressing up now, it highlights all the problems - my arms and waist are too fat to fit into most clothes - rather than making me feel good. I don't know which about make-up, and I'm damned if I know how to find concealer that actually matches the shade of my face (which bit?!), so make-up seems to make me look worse rather than better.
I've also lost that sense of strength and competence in my body that I had when I was more mobile and spending my weekends out climbing and hiking.
I've realised the thing that's probably quietly making a significant difference is that I'm stressed to to my eyeballs, not getting enough sleep ever, and not spending much time outside.
So I guess the one thing I can do, as the days get longer, is lie in a meadow.
I don't have a magic answer. But god, it took becoming chronically ill to really realise that the important thing is what your body cando, not what it looks like.