Life span counts years. Health span describes how many of those years you spend strong, clear-headed, and independent. The second number is the one most people actually care about.
Prevention works better when it is specific
General advice applies to everyone and fits no one exactly. Screening that accounts for your family history, your current markers, and your own risk profile makes it clearer which changes are worth your attention now.
Direction matters more than a single reading
One set of results is a snapshot. Repeating key markers over time shows which way things are heading, and trends usually appear while there is still room to respond.
What this does not replace
No screening program rules out every future problem, and none of this replaces age-appropriate screening such as colonoscopy or mammography. Those remain important on their own schedule.