Interesting. There is one story in the scriptures about a man in the Buddha's day who became a monk, and supposedly he was able to live to a hundred and sixty. He never had a single day of illness. Now, the average lifespan in those days was actually around a hundred. Ananda lived to be a hundred and twenty, another leading disciple, Maha Kassapa, lived to a hundred and twenty, the Buddha actually died young, he died at eighty. Young, at eighty.
So the average lifespan was actually around a hundred, it was common that people would actually live to a hundred and twenty, but this particular man would live to be a hundred and sixty, without becoming sick in his entire life. The reason for it -- he was a doctor in five hundred previous lifetimes. He saved people's lives, he cured other people, he did so much good Kamma, in that particular area of helping other people with their health, that all the goodness came back to him in his last life, he was able to live such a long and healthy life.
This could be a simple law of Cause and Effect, if you do a lot of good in a certain area, then it's often in that area that you will benefit in the future.