In the real world, this may not hold for niche knowledge streams (eg theoretical CS). 21-year-olds growing up in the 21st century can optimise far better than 3

In the real world, this may not hold for niche knowledge streams (eg theoretical CS). 21-year-olds growing up in the 21st century can optimise far better than 31-year-olds, with far better availability of specialist knowledge from a much earlier age