Lou, you’ve gamed it out pretty well as far as I can see. I never really relied on doubling time because I felt that it could always change and possibly accelerate - yes, I am a pessimist.
There was one interval in which it almost doubled in 3 months and that bothered me, but then it held fairly steady for about a year before going up steadily in the last year.
I am 70 and fairly active and healthy so I could see myself living long enough to get metastasis; that was the basis for my decision.
Maybe at 75 my decision would be different but I cannot say. You are certainly being realistic with your 5-7 yr life expectancy but there are so many unknowns in the equation it could be much longer…or not.
Another way to look at it is this: most recent studies show that post surgical PSA’s up to .7 may not even need ADT, so in your case you have over a year to reach that number, IF your doubling time remains the same.
Also, your outcomes from either treatment at PSA’s of . 25 or .7 are the same, so why not wait? Not medical advice, just another perspective. Best,
Phil