Again, Watchamacallit is right on, and I hate agreeing with people, no fun in that.
But....at his advanced age, the items mentioned above are very real concerns.
Then, go for it as bksmpower says, I like the thought of starting at trt levels, monitoring and enjoying the growth, strength, libido, and sense of well being--It's f#cking fun.
Maybe a little dbol (liver toxic, I know, but he made sure all is fine before he started. and it's only a short time) , or a fast acting test ( not prop, he will quit for sure then) at the beginning to kick start all this, as newbies tend to get impatient on the first cycle.
PCT is a minor concern here, it depends on what test levels are even left to go back to.
No way to tell by the physical characteristics of hypogonadism, because at his age his balls are hanging low no matter what.
If I'm wrong then HCG is needed, and maybe you should quit the exogenous testosterone. You can just stay on trt if you like. Doesn't really matter to me. Then, use that as a base to launch future cycles. After you have determined that it is safe to do so.
If all works out well, you have your trt levels keeping you hopefully in high normal range,
then leaping of that into 6 or 8 week cycles, coming back to trt levels.
Do that and you will have a great time until you die at 65 from one of the above disease.
I'm really not joking about that, it's a trade off we all choose at some point in our lives. A safer bet at your age, is to learn about HGH and other anti aging peptides.
I'm not going into that in this thread, way to off topic.
Good luck