The thing is when going on a test cycle without an AI, even a small one at 300mg, you're going to retain some water and put on at least 5lbs (2.5kg) of bloat that will go away after cycle. But at 50yrs old you would have to think getting natural test started up again would be tough after a cycle.
For the OP
@Titan72 I've tried everything you've mentioned and Primo was the easiest on my body and blood test results, except it raised my hemoglobin/RBC count more than anything (but iron intake is a factor with that too.) It also gave the least results mg for mg. Consensus says it is a good feeling compound, as is Masteron. I have not done just a test/masteron cycle though.
Anavar at 10mg/day should have a little negative effect on your body too except it'll temporarily trash your lipids somewhat. It'll help your body heal though and some think it gives your skin a more youthful appearance too. And it's quite anabolic mg for mg.
Many people your age take low dose deca for the joints.
But if it were me with your goals, I'd do something like:
300 test
400 primo
weekly, and
10mg anavar daily.
And optionally if joints are a concern, and you're not doing a PCT:
100mg deca weekly
But as for health goes, unless you're wasting away any significant weight you put on whether it's fat or muscle is a health risk. There's a reason slender people live longer, right?