1). More mellow you start to be less bothered by the little things as you get older.(unless its a SO).
2). Normally willing to spend a little more money.
3). I have heard a few time that the younger guys are to full of themselves and expect oohs and ahhs.
4). Ya I think the kids age might have something to it.
5). I also think we really do feel grateful they are there for us and express it better.
Funny though as I bet most of us see younger women than us. Of course this is just hearsay and speculation.