Age dont matter that much i think. No longer. Enchanced athelet stated. If i got one more chance i would have started earlier. Your gonna fuck up your hpta later on no matter waht and waiting to 26 wont help ya given those mafakin runs u are going to do.
But most important. Use as less as possible. U dont need it before 24-25. Then u dont know shit and you got all the hormones u ever need to rock world. Just digg deep in the knowhow departement.