Interesting subject. It would be interesting to explore just how long humans would live if deprived of ageing stimulants like stress, GM foods, pollutants etc. As seen in the 'green zones' regarding life expectancy.
In relation to treating ageing and disease with 'tissue regeneration, stem cell treatments' etc. My belief is that this methodology focusses on patching the negative effects of unnecessary abuse rather than stimulating the original source, being that the mind/perception influences everything (we are in essence only energy and thought after-all). If we could somehow live and be more present, grounded, live each cell, omnipresent maybe, then death could only be an eventuating choice. Shit, time may even disappear completely!
'Disease cannot exist in an alkaline environment' I hear regularly. Mans conundrum is that he is trapped between being part base physical and part spiritual. Man wants his cake...without the repercussions.

Quantum theories into DNA purification are also very interesting....