A three-year study of nearly 4,000 adults found measurable brain-health gains from ages 19 to 94. The finding is real — but the sample skews narrow and there's no control group.

Blocking the enzyme 15-PGDH regrew hyaline cartilage in old mice and stalled arthritis after ACL-type injuries. Human tissue responded too — but this is still a mouse study.

A trial in adults with HIV found semaglutide slowed one measure of biological aging by 9% versus placebo. Researchers call it an early signal, not evidence the drug reverses aging.