Here are my disconected jottings, for what its worth.

They say that the snipers alley is aged 60-70. And if you get to 70 it gets less risky.I'm not convinced.

My consultant told me that he deals with strokes as early in life as 2yrs old. He also said that fitness will not prevent a stroke but may assist in recovery. There are 40k TIA strokes every year in the UK, and all ages. Recovery, even from these will vary. Life changing strokes are not included in that statistic, and in the two days I spent on the stroke ward, I saw many people who will never be the same again.

But you can't go into cotton wool mode either. I've known three serious runners. The type who are stick thin, eat salads and run every day. Two ended up with pacemakers in ther sixties. All three were dead before seventy. My mother, who dodged most life extending activities made it to 93, but dementia took the last three years.

Some friends are moving house, 250 miles south of Derbyshire. They are seventy. Good luck to them but that's not something we would tackle at that age.They don't really see mortality as looming in the distance.

So all I can say is watch the dashboard lights. Blood pressure, cholesterol, diabetes, excess weight, inadequate exercise, and so on. Because in the end its a bit of a lottery.