Healthspan means the years you live in good health, not just the total years...

https://fair-wiki.win/index.php/Is_There_a_Best_Diet_for_Healthspan,_or_Is_That_Not_the_Point%3F

Healthspan means the years you live in good health, not just the total years you’re alive. While the U.S. sees a 12.4-year gap between lifespan and healthspan, meaning many years with illness, purpose and connection can help close that gap