No-one has mentioned poor eating habits. I would suggest reading 'Grain Brain' by Dr David Perlmutter. He blames poor health, inflammation, type 2 diabetes and Alzheimers on our eating too many carbs including sugar, processed food, and not enough animal fat (not transfats or canola oil, which are deadly).
Well, I cut out all wheat products, such as bread, cakes, biscuits, and I never drink soft drinks nor sugar in my tea/coffee. I have as much natural fat, meat, fish, eggs, real butter and other dairy as I want, plus lots of green vegetables with butter on, and fruit. I'm perfectly healthy and strong, and I've stopped piling on the weight, which happened after I retired. My husband reckons I'm mad, and he eats what he wants except for sugar, as he was diagnosed with diabetes 2 just after he turned 70, four months ago.
He has multiple health problems: I have none. He keeps saying 'wait till I'm as old as him', but he's been saying that for years, and he's only 18 months older than me. He has painful hands and feet, headaches, insomnia, severe depression, and other diabetes side effects I'd rather not mention.
I give him healthy meals, but he always demands bread. I try to suggest alternatives, but he gets cross.