Some of it is also that women like feeling desired. It's a game. She gets status points from her peers for every reasonably attractive guy who displays interest.
I’ve been married most of my life (same woman) and the concept of me being charming or flirtatious at this point is just beyond silly, however despite being old enough to be a grandfather women out right proposition me in front of my family, in grocery store lines, etcetera and it’s not likely that it’s cause they find me sexy-—they see stable, successful, possibly wealthy (not really) and think they may have a shot at acquiring something.
My normal response is to politely decline but at times when its flagrant and repeated telling them to fuck right off works pretty well IF my wife hasn’t already belittled them to tears.
Willing to bet that a lot of that latter group thinks they have been mistreated or denied something they are entitled too