It's age and maturity and recognition.
Eg the first time a married man hit on me (I was 18) I remember being quite flattered. I had no idea that this was just what men did and I think my reaction was along the lines of, "Wow, this man is married and has a wife and yet he still noticed me!" It was just a bit of harmless flirting but I had no concept of the fact I wouldn't have been the first or the last. Or that his wife wouldn't have considered it 'harmless'.
By the time I'd reached my 40s, I was just telling married men who hit on me to fuck off.
Oh, really, what is this I see before me? Another married man whose wife doesn't understand him? Who has agreed with his wife that they'll stay together until the children have left home and then they'll both be free? Who has been married for 10 years and never looked at another woman until he saw me? Who has never felt this way before? Who never has sex with his wife?
Please, do go on Random Man/colleague/friend's husband/dad of my child's schoolfriend...
Or just fuck off and don't be a dick.
As for the other stuff, I told my mum and her friend when I was 15 (so not menopausal) that I wasn't going to get married because it was just servitude and I couldn't see how it benefitted women.
They laughed at me.
I did get married (and divorced) and now co-habit with a partner but never had anything less than equality in terms of domestic chores, child rearing or mental load.
I've never carried a man and I never would.