Ok.. you feel 'sorry' for younger girls just because they don't share your musical preferences? Whatever.
I grew up on ZZ top, Black Sabbath, Iron Maiden, Pantera and all that good 80's metal. I love a lot of the songs and remember my parents dancing around the house like teenagers while they jammed out.
However, now that I'm in my 20's and have my own personal tastes I prefer Gore Core Death Metal. Bands like Dying Fetus, Cannibal Corpse, White Chapel, Oceano.. stuff like that. I also like ICP, Twiztid, Tech N9ne, 666 Mafia (before they got all pussyfoot on us). If I saw You at a place that was jamming That type of shit and saw that you weren't into it, I wouldn't feel 'sorry' for you. I'd just assume you and I had different tastes. It's not a reason to pity you.
If you were happy with your 40 something woman, right on... but that's no reason to put down younger girls just because they aren't interested in everything You are. (and just IMO, you do come off like you're judging younger girls in a negative way)
Oh, and I think you mean FEEL sorry... not FELL sorry.
EDIT: I'm sorry in advance because this is some blunt shit and I say it in hopes to open your mind a bit:
You say you feel sorry for them for not getting into the music.. and that you left with an older woman. It seems maybe you feel sorry for the young women, because you didn't choose one of them at the end of the night.. as if that's the only real reason they were out in the first place, just to get 'chosen' by some guy to go home with.
Sure, some women do stuff like that. Not ALL of us do. Some ladies like to go out just to get out of the house and have fun.. not to impress people with their dance numbers and musical preferences.