Good health is in my dna.

Every one of your ancestors, without a single exception, lived long enough to have a child. That is an unbroken run through famine, plague, war and bad winters — thousands of links, not one of them broken.

Some of what they got through is written into you. Immune quirks, repair mechanisms, a heart that started before you were born and has never once been asked to keep going.

That inheritance does not come with a schedule attached. What it is, is a record of an extraordinary amount of surviving already done, and you are holding the current copy.