At almost 33, I feel I've gotten pretty close to what I can do size and strength wise with my individual genetics without pushing the AAS envelope further, which is not going to happen. In fact, I see myself using less and taking more time off in the future.
It took me a while to accept that I wasn't probably going to be any bigger or stronger, but I am fine with it now. I find myself challenging myself in other ways, doing things like taking shorter or no breaks between sets, going for higher reps, doing drop sets, etc. I'm also doing more cardio stuff.
Its become harder and harder for me to just maintain my strength and size, so just fighting to not lose anything is already challenging.
I won't stop training because I don't want to wither away, and I also just can't get along with myself if I'm not training regularly....I need it for my mental health and overall well being. It helps with mood, sleep, and gives me some sense of self worth... not necessarily the strength or looks (they help) but the sense of worth you get from knowing you have the discipline and knowing you pushed yourself yet again. That's enough to keep me going even if my traditional ways of measuring progress aren't what they used to be anymore.