Well, him being 52 years old and having already ran several cycles throughout the years, I doubt anything you or I can say will pursuade him or make him think twice about what he wants to run and how he wants to run it. It sounds like he uses deca for the joint soothing properties and nothing more. Does he ever come off it or he just continually runs it to aid the joints? Now I do know old timers who uses deca for that reason along with their TRT and they do not come off, they just switch up the compounds, for example, deca will be run for 16 weeks, then they will switch it to EQ, all the while running test and HGH with it. By no means am I suggesting he does this, I was just stating what I know of others doing. I am not a doctor or a "guru" so I can not recommend a specific protocol for your uncle, but if what he is doing works for him, then in my opinion why change it. Why try and fix something that isnt broken.