Most health advice imagines aging as a steady slide. Once you hit 40, people joke that you’re “over the hill,” as if from there it’s one long, smooth coast downward. Your biological age and your rate of aging get boiled down to a single line you’re supposed to flatten with healthy habits. It’s a simple picture, suspiciously so.
If you could watch your body age in time-lapse, it wouldn’t look like a slow, even descent. It would look more like a long drive down a mountain road: stretches where you barely touch the gas, stretches where you suddenly hit a…
