Yeah West in his seminal "Scale" kind of corroborates the whole story.
It seems, though, that the molecular changes you are undergoing do not immediately translate into increased mortality, so you're going to have several more years of - presumably - feeling well until the big drop-off starts for all of us at about 60.BTW, because of its wide range of topics, its solid scientific underpinnings and its excellent intellectual accessibility, this is one of two books I positively think should be taught at any school, the other one being Solé's "Phase Transitions."
Depends? Liquid nitrogen can freeze a lot of vibrational degrees of freedom in place, but if you want molecular rotations to stop as well, there's no way around He.