Is it more OK, common these days with age gaps?

When I was young in my late teens. 20s it happened that older guys that were close to my dads age would flirt with me (which I found odd and not into). Now in my 40s it has happened that guys that could be close in age if I had a son does the same (flirt), I can't imagine they mistake me for someone from their own generation. I'm talking about RL meetings now, not on Internet. My question is has there been a change that in this modern time it is today more OK, common for guys to hit on older women than it has been before? (For me I never been into age gaps like that, how other people function with it is up to them, not saying it's right or wrong).

Is it more OK, common these days with age gaps?
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