Scientists have created vampire mice and shown that the blood of young victims helps reverse aging in the old vampire mice.
Reference: 'Vampire therapy' could reverse ageing, scientists find
“This could have been done 20 years ago,” said lead researcher Dr Tony Wyss-Coray of Stanford.
(But for those fools and their foolish "morals")
"Future studies are warranted in aged humans and potentially those suffering from age-related neurodegenerative disorders."
We all know how that's going to end up...