It makes sense that being young and fit is generally seen as more attractive. It simply looks healthier.
For the rest, you are BU. Not that many people find the fake nail/ tatooed eyebrows that attractive. I have heard a lot of men who would much prefer a more natural look!
Now some 50 year old look BETTER with some help than they would without. Fair enough, we are lucky to have some much help available if we want: brighter teeth, shiny and beautiful hair, some filler to make you younger.
Beauty standards haven't changed much, a symmetrical face always help, but there's no such thing as a universal standard for men or women. Some like geeky, others like muscly, some blonds, some dark skin.
42 is not too late to make you the best you can be. You just need to be happy with the way you look, and work towards what you can change.
If Marilyn Monroe had been brainwashed into thinking only Audrey Hepburn could be attractive, she would have never left her house.
There's beauty, and there's being attractive. Even if you are not a classical beauty, you can still be very successful and attractive. It's fine if your appearance matters.