Universities. That explains it; they're pseudo-educated.
I'd to see this broken down by profession/degrees held.
Arnold Denker, the Dean of American Chess, died last year at the age of 90. He was often quoted as saying that Chess was a balm against Alzheimers.
There are quite a few rather aged GM's, although they've lost some of their playing strength (200 rating points: 2700->2500)--Smyslov, Gligoric, Larsen. Victor Korchnoi (75) is still giving the youngsters grief.