The answer isn’t simply extending lifespan, it’s extending healthspan and importantly happiness-span. To me it is better to live fewer days total, but happily, than more days unhappy.

Our hypothesis is that BAT protects against impaired healthful longevity, i.e., obesity, diabetes, cardiovascular disorders, cancer, Alzheimer's ...

They tested 122,007 patients age 18 to older than 80 and then slotted each patient into one of five categories based on their cardiovascular-fitness level. Elite performers were defined as the ...