RETINOPATHY A MARKER FOR COGNITIVE DECLINE. “One thing noteworthy here: the vascular system is incredibly important. If I had to choose just a few rejuvenation therapies out of a much larger set then one I’d be tempted to go for is a complete rejuvenation of the vasculature. Aging blood vessels do not deliver enough nutrients. They also rupture, causing dead of neurons in the brain. The damaging effects are manifold.”