I don't have a problem with this, as such, but I wonder how common it is as its not something I've ever seen before. I certainly didn't do it and none of my friend did either!
My daughter is turning 18 soon and all of her friends are of a similar age.
One of her friends, probably the only one who is round here often, is 18 in a few months time. I also have a mid 20s son.
My daughter commented a few weeks ago that she was uncomfortable with the way this friend behaves around her brother. Very flirty, talks about going out, having sex, getting drunk. My kids have discussed it and he is also a bit uncomfortable what with only being a few years older than her. He and his sister are close and go out together. Sometimes this friend went too but they've put a stop to that now she's older and these behaviours have emerged. He can see it for what it is and teenage girls flirting with their friends' older brothers is as old as time itself.
But it made me realise that she does it around my partner too!
He's 60. Literally old enough to be her grandad and the same age as her nan! So I know she is 'practisung' and not actually interested but it's weird!
I don't remember flirting with my friends' dads and they certainly didn't with mine.
Have I been living under a rock? Is this commonplace behaviour?