So on the one hand this is terrifying. On the other hand, how many of those companies existed 10 years ago? Our industry is exploding in size currently. If y

So on the one hand this is terrifying. On the other hand, how many of those companies existed 10 years ago? Our industry is exploding in size currently. If your industry is doubling every X years, then after 2X years it is impossible that the people who were working in the industry 2X years ago will be in the majority. The new people have to come from somewhere, and they almost always come fresh out of college. So the average number should be way far down. You're taking the average width of a triangle. What I'd be more interested in, is percentage of people at each age still employed in the industry, that haven't left. So, for example, if there were 1 million developers in software in the USA in 2000. What percentage of those developers were still developers in 2010? 2017? What percentage left the industry?