I think it's reasonable to suppose that one could oscillate between being biologically 20 and biologically 25 indefinitely.
Aubrey de GreyMost scientists will get serious media exposure about twice in their entire career. And they'll get that because they've actually done an experiment that was interesting.
Aubrey de GreyI dont often meet people who want to suffer cardiovascular disease or whatever, and we get those things as a result of the lifelong accumulation of various types of molecular and cellular damage.
Aubrey de Grey