This article is part of a series on recent advances in the science and medicine of longevity. What do blood transfusions, exercise, and a longevity hormone have in common? All three help improve ...

As we age, our immune system quietly loses its edge, and scientists have uncovered a surprising reason why. A protein called platelet factor 4 naturally declines over time, allowing blood stem cells ...

For years, scientists have known that the anti-aging hormone klotho, infusions of young blood, and exercise each improve brain function in older mice. But they didn’t know why. Now, two UC San ...