Very little research currently goes into attacking aging directly - as opposed to handling things that are in no small part downstream from aging, such as heart disease. A big reason for poor "longevity gains" is lack of trying.
Sleeping well, eating well and exercising does work. Science about this is well-established. So why arent we?
It would not raise the life expectancy to 100 years but it would considerably reduce the health burden on the economy.
Because although longevity is a nice recurrent idea for everyone in theory, when the rubber meets the road people routinely want to optimize time spent in living in pleasure.
The pleasurable stuff is almost all about "YOLO!" in every domain. A candle that shines twice as bright ends up consuming itself twice as fast and all that