Based on the US offsite statistics (from the training excel), i'd say that it is less affected or negligibly so. My stats may obviously change a lot depending on skill level and various other factors but generally: For a 7"6 player (inside freak that is), the difference in number of weeks per pop (holding levels constant) between age 18 and age 23 are: JS = 6.03JR = 8.84OD = 8.03 HA = 5.10DR = 4.02PA = 3.44IS = 3.68ID = 3.68RB = 3.68SB = 3.36For a 6"0 player (Spud Webster), the difference in number of weeks per pop (holding levels constant) between age 18 and age 23 are: JS 5.00JR 4.28OD 4.73HA 3.79DR 4.65PA 4.02IS 6.80ID 6.98RB 6.31SB 4.73