It happens too frequently to be a coincidence. Walking through a shopping centre a late teens or twenties GG (and sometimes older) will notice me and we exchange smiles. Theirs is a very pleasant knowing sort of smile like saying "I know you are male, you look OK, enjoy your day".
Not just the younger ladies either but such an interaction is rarer with the 30 and 40 year olds. It absolutely makes my day,
I spend a lot of time at a major library frequented by younger university students. I'm hardly noticed there and there is no hesitation in someone taking the table next to mine.
We can only hope that social norms might be changing with the younger.
Michelle