I think I am still most in tune with my friends from university because we have, by and large, had similar life experiences and kept the same attitudes and values. I am part of the generation that benefited from the broadening of access to university in the sixties, experienced the student revolution, became a feminist in the seventies and worked outside the home from when my children were tiny. I feel pretty much in tune with my daughter's friends because she has followed a similar path.
There are, of course, lots of people from all generations with whom I have very little in common, others I get on with as long as we don't discuss politics or religion and others who I recognise as soulmates.
I don't like the idea of "it's a generational thing", because I think it is a sweeping geralisation that means nothing.