My MIL was 90 when she died very suddenly. A couple of years before, she went to see the Doctor who looked at her notes and worked out that the last visit she'd made had been 3 years before he was born. She took garlic capsules in winter and an odd nip in her tea, she shopped almost every day and did all her own gardening. Heating was for wimps unless it was below freezing and that wasn't financial.
We got a call from her one Saturday morning, a year or so before she died, "Just to let you know I'm in hospital, I collapsed on Wednesday in Morrisons, don't bother coming over if you were planning to" The dirty looks we got from the staff when we arrived!