My godmother is 89, walks daily, has always kept a pet, cooks and eats home cooked food, healthy weight, sees friends, chats on the phone all the time. Doesn’t drink and gave up smoking decades ago. Shows no sign of decline thankfully.
My mum, had a really busy, active healthy retirement. Travelled the world well into her 70s, ate well, healthy weight, played badminton, did ballroom dancing, active role in her grandkids life, very sociable. Didn’t drink and gave up smoking decades ago…then was struck Alzheimer’s at 75, rapid decline, died at 79.
So…luck to a degree. Doing all the right things doesn’t guarantee life beyond your 80s. Doing all the wrong things doesn’t guarantee early decline, but you’ve got to do what you can to stack the odds in your favour.