Thanks, for the info about the thallium, Oak. It's something I would like to have done, regardless, sort of as a benchmark.
LPH, I generally have very good genetics. My mom died young of an autoimmune disease, but 3/4 grandparents lived until 91-92 and the one that died at 79 (he was the one who had a heart attack at 60) died of cancer. My dad is 87, still active, despite the stents in both heart and legs, prostate cancer for 20 years, and being a life long smoker. Nothing wrong with his brain, either.
I don't want to over think this; in my case it's dumb luck. My DH has made me hypersensitive to all of this, but he is a living example of how modern medicine and lifestyle can allow someone with genetics from hell to ride 3K miles a year, nordic ski, and run.