I am currently training two guys who are 6'2, one is a 20 y.o., the other is 21. obviously they have gotten the same training every week. The 21 y.o. has 6 pops over the last 12 weeks while the 20 y.o. has 9 pops. This has been my first time training a player older than 20, but it has definitely been the biggest slowdown i have seen training a player.