I think a lot must be down to a person's genes, my old dad smoked 40 untipped cigs every days, liked a drink,
and was brough up on bread and dripping, but he died in his early fifties of a massive heart attack due to heart disease. His brother, my uncle, whose background was the same, died of a massive heart attack at 44.
Our next door neighbour, an old boy in his 90s boasts of a similar lifestyle but is fit as a butcher's dog, says he hasn't caught a virus or had covid for years, and is able to keep his allotment and garden in order as well as volunteering at the local hospital. His older brother is still alive and just went on a cruise!!