Fair point, thank you for adding this. I grabbed the notion from memory, and I don't even know if the source mentions age cohorts. I think it is fair in the co

Fair point, thank you for adding this. I grabbed the notion from memory, and I don't even know if the source mentions age cohorts. I think it is fair in the context of the OP as a mid 20's developer, but agree wholeheartedly that it doesn't need to be applied with specific ages in mind, but rather more broadly across an adult life.