your asking IS IT POSSIBLE
that depends on wat your goals are
is it likely you will achieve your goals and be able to maintain them? that depends wat your gaols are
if your goals to bench 455, or have 20 inch arms ripped, then its very unlikely u will ever maintain it or stop using ass
if your goal is to bench 315, and have 17 inch ripped arms, then that is possibily maintainable without aas
u need to tell us wat your gaols are before we can tell you is it possible to stop aas and keep wat youve achieved
simple rule is the greater you goal, the less likely you are going to be able to maintain it, and of course theres a point where its not maintainable without AAS