We know that players aged 18-21 gain the same in training,so it shouldn't be any difference of how many greens will be needed to lift 2 players ,one 18 yo and another 19 yo,from 100% to 120% (if the players are the same,not one fast trainer and the other slow trainer)
Nik done a lot of studies here https://forum.topeleven.com/tutorial...-trainers.html
Also here in Al's guide could be some mathematical proof
https://forum.topeleven.com/tutorial...ng-system.html
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