There are many factors that should go into your decison on how to train while on gear vs while off gear or "natural". The biggest factor should be diet in my opinon. As we all know or should know diet is 85% of the battle while on or off of AAS. In my experiences you simply cannot use the same diet on AAS than you can off simply becuase you can burn and need more claroies on AAS than off, however when it comes to diet in my opinon you must be as diligent with it otherwise you will end up carrying far more excess fat. as a natty you know your limits on how many calories you need to eat in order to gain the most amount of muscle and least amount of fat.
While the same holds true on AAS, the point simple fact is you can consume more calories on AAS but its the type of foods you eat. I have seen many bodybuilders eat MCDonalds and all types of crap on AAS and think they can get away with it simply becuase they are on when this isnt the case. Bad calories are still bad calories and they need to be monitored the same while on than off.
As far as training goes i would take that by an age basis and adjust your training accordingly. Obviously you cannot train the same way as you ddid when you were 25 when you are 45. You can still train heavy or light, or long but not a combination of both. I think if you try even while on you will begin to place too much stress on your joints, ligaments, and tendons and break them down to a point where they can become permanently damages. although while on AAS even at an older age you do have the ability to recouperate from stressful intense workouts you will still need more rest inbetween sessions that you wouldnt necessarily need when you are younger.
In the end AAS are not the magic pill or injection that help you break past your barriers. Its how you train and what you eat and the AAS are just tha small nudge that push you over the egde. As we all know if you take AAS and do nothing are you going to end up like Ronnie Coleman? No. You'll end up like Larry the cable guy.
You have to adjust the other variables in your training to gain the maxium effiency from the usage of AAS at any age although AAS do make it easier even when your older.