I’ve come across that as well, but in presentations. I think it is either Alan Kay or Bob Martin who likes to use the statistic. I recall it being framed in terms of the growth of tech/programming as a profession: it’s doubled every 5 years; the fact that 50% of developers have less than 5 years of experience. This is simply exponential growth stated in two different ways.

I do a lot of work on a platform that has doubled in user base yearly since its inception, for about a decade (though I think we are at an inflection point now or soon), and it is wild to have “experts” be those with 2 or 3 years of experience. Having used the platform for 11 years, now it is crazy to believe I have more experience than 99.9% of the field.