1/2 inch to arms in 6 months?

[2xChamp]

ok check it out. i have been lifting hard for the last 10 months and have gained a solid 1/2 inch to my arms. i have been doing everything right (diet,protein,creatine,rest,compound lifts,calories etc.) is it possible i wonder, to gain and additional 1/2 to my arms in the next 6months as well if geared more towards it? just curious to hear some input on the matter. i know it takes around 15-20lbs of overall muscle to add around 1inch to the arms. and it takes around 1 month to gain about 1 pound of muscle. at least thats what the experts say. also ill be the big 30 years old this year, dunno how much that has to do with it though...

[2xChamp]

ok check it out. i have been lifting hard for the last 10 months and have gained a solid 1/2 inch to my arms. i have been doing everything right (diet,protein,creatine,rest,compound lifts,calories etc.) is it possible i wonder, to gain and additional 1/2 to my arms in the next 6months as well if geared more towards it? just curious to hear some input on the matter. i know it takes around 15-20lbs of overall muscle to add around 1inch to the arms. and it takes around 1 month to gain about 1 pound of muscle. at least thats what the experts say. also ill be the big 30 years old this year, dunno how much that has to do with it though...

i think i might of answered my own question. still, input is much appreciated!