Aubrey de Grey from Ending Aging:

There were actual land sites all over the planet that should be very badly contaminated by lipofuscin [waste byproducts of metabolism that our cells can't break down and, therefore, contribute to aging.], because their soil has been seeded with the stuff for generations. I speak, of course, of graveyards.

...

there was no accumulation of lipofuscin in cemetaries - and if it were there, we certainly ought to be aware of it, because lipofuscin is fluorescent.

-page 121

Aubrey de Grey's answer: Xenocatabolism. If there is a food source available, bacteria will evolve that can eat it. And if bacteria can do it, why can't we steal that ability for ourselves?

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