There have been willpower studies in young children. The findings were something like: - Willpower at some point (age 4?) actually goes down for some period of

There have been willpower studies in young children. The findings were something like: - Willpower at some point (age 4?) actually goes down for some period of time. - Willpower at (I believe) age 8 was highly predictive of future success. Higher than IQ, but - Willpower (I think here measured as focus) tends to increase with IQ.