In 20 or 30 years you can look and see if he's 99th percentile for his age along whatever metrics (mile run time, VO2 max, skin elasticity, etc.) and that will

In 20 or 30 years you can look and see if he's 99th percentile for his age along whatever metrics (mile run time, VO2 max, skin elasticity, etc.) and that will be an obvious sign of a successful experiment.