is training now will slow down my gaining in the future?!?

[GFORCE]

i'm 14 years old training 1.5 years and gained pretty big mASS
i got freaky genetics ,my grandpa was huge and my father still huge ...

my brother is 16 and half and he gained and he gained all what i gained in 1.5 years- in one month! ):

my hormons are still not high enough and he is in the top

now i'm training very hard until completely failure,my physiological
limits are very high although my age

and my muscle get use to very high resistance,i read that after 2-3 years it's very hard to gain mass,

my question is-2-3 years more that my hormons will be high
is the gaining procces will be slow down because my muscle get use to high resistance? or even be faster because i be more skilled?

[scott_donald]

well what is your diet adn your current routine thats is the best way to help you... DOnt worry when you mature you hormone levels will rise making it easier to pu on weight...well in you later teens....