recently i have been getting as much info as possible before starting my first cycle and one thing that i have heard is that a cycle done too early before reaching genetic maturity could prevent u from making natural gains after your cycle is over. i also think that this first cycle could be the only one i do...and would like to make the most out of my use of AS and get great additions in size and strength that i can keep and not loose in a week which would only want me to cycle on again....my question is at 20 or 21 years old are u genetically ready for AS even if u have a few years of training experience and how much truth is there to the idea that AS usage too soon will limit natural growth after the use of AS...thanks for ur input and responses to this post