Now in my 30s, I am probably considered ancient to a 19 year old male for instance, I don't expect them to find me attractive as in a prospective partner, but equally I couldn't care less what they think of my looks as i am not interested in 19 year old men myself.
At 50, I don't expect men in their 20s/30s to consider me as dating material, and I expect to be considered too old for them. I'm sure I could be considered attractive to men of a similar age/not too much younger.
If a 50 year old male rejected me as a 50 year old to date a 25 year old woman instead then I'd consider it a lucky escape really.
Surely it's all relative? I'm sure a lot of men in their 50s/60s do find 20 year olds highly sexually attractive but personally I wouldn't want to date someone who's aiming for that age.
I don't believe in the concept of invisible. People say they used to 'turn heads' a lot, but we don't see every single person looking at us. And surely validation shouldn't come from whether some man is gawping at us as we walk down the street.
I saw a woman the other day who looked around 70, her face was lined but she had quite 'young' clothes and make up, she had such beautiful eyes and auburn hair. It's all relative I think.