Many members of my dad's family lived to a great age. His cousin died last year aged 102. I visited her a lot. She opted to go into a home at age 90, as she started to struggle physically, but her mind was as sharp as ever until a couple of years before she died. She only had glasses for long distance, not for reading. I think longevity is down to a mixture of genetics and life experience. My mum's parents and siblings died relatively young. She is 87, but was the only one has had a stable marriage and financial situation. She did have a stroke 20 years ago and suffers poor health now, but she has my dad.