I think the easiest thing to do is eat well, not get too big or too small. Try to minims exposure to carcinogens. The worst of these is tobacco smoke that is horrendously toxic and deliberately inhaled into our poor lungs. This doesn’t need any power…maybe will power.
Increasing life expectancy comes from better heath care and living conditions. As we live longer we use more energy per lifetime, as a whole population we need to invest in a mix of renewable green energy solutions to protect our planet and ourselves for the long term.