BalancingConstants:Creature:CreatureGrowthSpeed
From PBnWModdingWIKI
Im going to tell you how to change the growth speed of your create, very simple to do.
Dir
BlackandWhite2\data\balance\creature_physio.txt
How To
Ok see were it says SecondsPerYear = 3600.000000 That means it will take 3600 seconds (one hour) for your creature to grow a year older. This includes the growth of your creature and its age stat. So its as simple as changing this number to however many seconds you want it to take for him to grow a year older. Set it to something like 0.000001 if you want him to be fullsize straight away!
--LudakoT 12:50, 10 Oct 2005 (PDT)
Note from Grilox: This actually does not change growth speed, only aging speed. Be wary