Recent studies indicate that both immunological and global aging processes can be reversed in humans now using repurposed medicines that are known to be safe.  The key is the thymus, the center of your adaptive immune system, which withers starting at puberty but can be fanned back to life even after the age of 60.  It turns out that a side effect of restoring your immune system is the reversal of the most reliable indices of generalized aging. Learn more in this recent Telluride Inside & Out Article.