The development of diseases depends only 5–10% on genetics, and habits predetermine health much more. Optimism, having a sense of life, and engaging in art genuinely prolong life. Proper nutrition and a good metabolism are not only about burning calories, but also about youth. In mathematics and biophysics, too, there are methods for studying and influencing aging.
The placebo effect can be stronger than medicine, and a person is capable of setting themselves up for longevity on their own.