When should I powertrain my player?

[Tactician]

Hijacking this thread because it seems to be taking a nasty turn.
Madflo. Do you know if anyone has done any studies on this? Is there any mathematical proof of how many greens it takes to lift a player 20% as an 18 year old compared to the same player at 19 years old if the player is being pushed for example from 100% to 120%?

Progress in training decreases with age. This is something that was more evident on the old version. Maybe it is not that much noticeable from 18 to 19 years of age (hence, insignificant).