Like you, I'm 74 and I am not going to have the plethora of tests they think someone my age should have. I have never had a colonoscopy and at this age never will. I also will never have another pap smear (haven't had one since my very early 60's), mammogram, etc. I love your statement that whatever I have I will either live with or die with, though I'm not tired at all.
If you haven't already read it, I remember a blurb taken from an interview with Barbara Ehrenreich in the AARP Bulletin about two years ago where she says basically the same thing as you did. It was from a book she wrote (and she does have some very impressive credentials outside of being an author) titled "Natural Causes". The book was a bit dry at times, but I still found it fascinating.
With regard to UHC and others calling and wanting in home assessments, I'm wondering why I never get those calls? I don't go to doctors unless I'm sick with something that isn't clearing up. I have UHC insurance too. I also don't answer my phone if I don't recognize the number, so maybe that's more the reason I haven't had these calls.