I suspect playing games with your test levels is far more common than people think. I didn't have to, cause my test was low due crohns disease, but I probably would have gone that route if I needed to.
TRT is for life, so you do it once and suck it up for a week.
The alternative is...well, you've seen the alternative all around you. It's rare to see a natty 60 year old who looks healthy (and I don't mean jacked). But there are guys in their 70's at my gym who look like prime Arnold. I won't go (quite) that far, but I'd take that over a slouch, a cane, and a gut.
As I transition through late middle age into being, well, old, I think about it a lot.
My urologist actually told me "If you can squat 300 at 50, you will squat 150 at 70. If you can squat 150 at 50, you will squat 75 by 70 and you won't be able to get out of a chair by 80". I see this with my own father. He is 76 and in serious decline and too weak to sit on a medicine ball without falling over.