It's called having a healthy diet and exercising regularly. People who eat mainly a Mediterranean diet live longer than people with other less healthy diets. There is already a big difference in people who are unhealthy and uncomfortable in their own body by their 60s and people who regularly practice moderate exercise and eat healthy diets who can live comfortable adventurous lives into their 80s and 90s.

Sometimes the world is cruel and someone does everything the can to be healthy and fit into old age but they are robbed of that experience by tragic events and/or disease. Life's not fair.

[This paper in Cell (pdf)](https://www.cell.com/cell/pdf/S0092-8674(22)01530-6.pdf) examines the role of endogenous retroviruses and senescence and was discussed in the latest podcast from "This Week in Virology."

During the podcast, they also discussed other research showing that, in mice, repeated blood transfusion from young mice to elderly mice over extended periods of time produced rejuvenating effects. Thinks like improved strength, thickening of cartilage, etc.

There is a very long way between that research and increased lifespan in humans, but my opinion is that it's worth considering the possibility we'll eventually get there. Or if not lifespan, per se, then better health through the lifespan (health span).