> If we take the 10000 hour rule as an example it takes 5 years of continuous effort. While your point about about teenagers having lots of discretionary time

> If we take the 10000 hour rule as an example it takes 5 years of continuous effort. While your point about about teenagers having lots of discretionary time to become better at what they choose to pursue is very valid, the 10,000 hour rule is a distortion of the findings of a study on accomplished violinists. It is not broadly applicable. The tradition of violin playing has hundreds of years of teaching and quantifiable and measurable performance indicators. Other fields, not so much.