I've known some pretty healthy and active 90 year olds that could benefit. The problem might be, that if the young heart pumps to strongly, thin or weak blood v

I've known some pretty healthy and active 90 year olds that could benefit. The problem might be, that if the young heart pumps to strongly, thin or weak blood vessels might start too leak under the higher pressure of a young heart. This happens when they give certain drugs to increase blood flow, on a weak heart, but then, for example, the eye blood vessels leak, causing macular degeneration. On the other hand perhaps a heart would be controlled by the body automatically whereas the body can't control a drug dose?