See http://www.bls.gov/opub/btn/volume-2/images/2-9-chart2.png http://www.bls.gov/opub/btn/volume-2/images/2-9-chart2.png A large number of the people that mad

See http://www.bls.gov/opub/btn/volume-2/images/2-9-chart2.png http://www.bls.gov/opub/btn/volume-2/images/2-9-chart2.png A large number of the people that made up the 3x growth in IT between 1990 and 2000 are just about to hit 40 now. That's a very rough measure, just looking at overall industry size over time (and granted, it's IT rather than startups), but it at least mildly suggests that the demographics are going to start flattening a bit as we hit more of a steady state rather than a period of extreme growth.