Totally anecdotal, but I have long thought distribution of programmer skill becomes increasingly bimodal as they/we age, with them/us either becoming particular

Totally anecdotal, but I have long thought distribution of programmer skill becomes increasingly bimodal as they/we age, with them/us either becoming particularly skilled or particularly unskilled. Either the one language/framework/paradigm that the aging developer is locked into becomes ever more aged and irrelevant, or else if the programmer has made good use of their time and experience, becomes particularly skillful and insightful and valuable with time. I've known some amazingly sharp older developers, and I've also known some particularly poor ones. Just a theory.