Parathyroidectomy soon or maybe later? Some direction sought here

I hope you might give me some info, direction and help on the matter of parathyroidectomy planning and thinking by me. I'm a slightly older than 75-year-old-guy who early this year, from various tests on calcium in blood, calcium in urine, bone density testing, PTH levels and then 3 key scans (US, CT, and sestamibi), was told by MDs that I really should undergo parathyroidectomy to remove one or more parathyroid glands. The analysis of my 24 hour urine catch showed no problem with calcium in urine. The 3 scans were *inconclusive*: the radiologists who read the CT and the sestamibi scans couldn't clearly find one (or more) parathyroid gland(s) larger and therefore abnormal. [The US (ultrasound) scan was done - I believe - just to study my neck and throat anatomy.] In late July, I met with an endocrine surgeon who told me that the 2 factors that indicate I need this surgery (in spite of not yet having awful medical problems from uncontrolled, unregulated calcium in my blood) are: 1) kidney stones (but this was long ago: there were 2 different times in the early 2000s when I had the 1st one which I caught in the strainer given to me and then analyzed in the lab---> it was the standard calcium type stone, and then another stone a few years after that 1st one, and NONE after those two), and 2) osteopenia (but I looked this up at Mayo or US Gov't or somewhere authoritative and learned that I think more than 50% of men over what was it, 50 or maybe 60 have osteopenia! [Incidentally: I asked my MD where I stand in the range of osteopenia. She said "Your bone density scores indicate you're right in the middle of osteopenia" if that news may matter here in this forum.] I said to the late July endocrine surgeon that since the 2 main scans were inconclusive, the 4 parathyroid glands must all be roughly the same side. He agreed and said that he'd remove either one or 3 of them based on what he sees happen to - I think - PTH *during* surgery. From some readings at the Tampa, FL Norman parathyroid-thyroid-adrenal surgery center, I learned that for a surgeon to know how to do this surgery really well, the surgeon should be doing at least 2 parathyroidectomies per week. I asked the late July surgeon how many he does. He said he does 2 per week (but he also does adrenal and thyroid surgeries so I don't know if he actually ever does 2 parathyroidectomies/week).

This coming Tues. I have a video call from another endocrine surgeon to find out what she's done and what she has to tell me.

Anyway, I wonder if you know how long this hyperparathyroidism takes to become really bad. Does it progress slowly? Is the progression based on speed with maybe older men (or people in general) having increasing problems as they age? You see, one friend, who knows nothing about this medical problem, thinks that maybe I can wait years before any surgery's done.

[Is anyone in the world doing any research on why the parathyroid glands become abnormal in some people? Is hyperparathyroidism due to our (in the US) lousy, dangerous, poisoned food system? Is it unseen and maybe unrecognized chemicals and hormone disruptors in our lives? Is it simply destiny from birth because one is genetically programmed to have this problem at some point emerge in life?]

What might you be able to tell me in the way of direction or helping info?