I don't know about statistics, but I've certainly known plenty of these people, being only a few years younger. (I was 12 in 1970) Most of them are normal adults with jobs, etc. There are a few "flower people" left, with various doses of the 60's still in them. They tend to be concentrated in specific areas like Boulder, CO., San Francisco Bay area, Sedona, AZ, etc. There are little pockets around the country. National Geographic did a piece about a year ago on an actual commune still in operation somewhere in the midwest -- I think it was Kansas or Missouri. It was pretty interesting to hear some of these people talk about their journey to adulthood. Probably the library has a copy if you're that dedicated... The thing that strikes me about the 60's is that this huge burst of energy, ideas, creativity, and conflict did leave a pretty big mark on my generation. But it wasn't big enough to produce a real revolution in what it means to be a human. I don't think true transformation will ever be a mass-market phenomenon: there's just too much individual work and discipline involved. I think it's always going to be for those few who finally realize -- typically after many years of trying -- that the common-sense formula of "live for yourself" is always going to produce a spiritual bankruptcy in the end. Each person has to learn that themselves the hard way, it seems.

Reality kicked in at 30 when they had kids and had to pay rent.

punk happened ... it stopped being cool to be a hippy

Come to Oregon, A.K.A. the Hippie Graveyard.