Hi Popzie,
I kind of understand your point, but I am 22 years younger than my DH, and we have a very good relationship, been together 10 years now. (Mind you, i am hardly young anymore.... 40 myself).
I am not young and hot, and never was, and it is not a father type thing, we fell in love, and have a great marriage.
But you know, when I first met DH;s friends, i got so much scorn poured on me. I was called a 'golddigger' (I am the breadwinner incidentally); a 'blonde bimbo' (I am not blonde); and a visa bride (I already have UK citizenship). I had many of DH's female friends refuse to acknowledge me or talk to me, they just sneered at me. Some of them, even after all this time still refuse to acknowledge me properly. (There is one who claims to never remember my name). I am not saying you are doing any of that, but it has actually made my life with DH a little lonely.
I guess what I am saying is that get to know these women for who they are. They might be feeling a little shy and insecure, conscious of the age difference and the approbrium that is heaped upon them. It is not an easy situation to be in. Also.... something people never talk about... if the relationship lasts, if you are the younger person you are very very aware that all things being equal, you will be a widow for a very very long time. I am also an only child, and my parents and husband are the same generation. I am very conscious that when the time comes, it will be me, and only me who will be the caretaker for parents and husband. As we have an 8 week old baby, I know that as my son is going through teenage years, I will also be dealing with illness and old age. I signed up for it,but it means I know that my current happiness has a time span.
So, just to say, that life could be a little more complicated for the younger woman, so what's the harm in being friendly?
:)