https://news.berkeley.edu/2020/06/15/diluting-blood-plasma-rejuvenates-tissue-reverses-aging-in-mice/

BLOOD PLASMA DILUTION REVERSES AGING - NO YOUNG BLOOD NEEDED

In humans, the composition of blood plasma can be altered in a clinical procedure called therapeutic plasma exchange, or plasmapheresis, which is currently FDA-approved in the U.S. for treating a variety of autoimmune diseases. The research team is currently finalizing clinical trials to determine if a modified plasma exchange in humans could be used to improve the overall health of older people and to treat age-associated diseases that include muscle wasting, neuro-degeneration, Type 2 diabetes and immune deregulation.

Feels like one of those hidden cures to me…