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 = 6.03
JR = 8.84
OD = 8.03 
HA = 5.10
DR = 4.02
PA = 3.44
IS = 3.68
ID = 3.68
RB = 3.68
SB  = 3.36
For 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	5.00
JR	4.28
OD	4.73
HA	3.79
DR	4.65
PA	4.02
IS	6.80
ID	6.98
RB	6.31
SB	4.73