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In principle, if you understood the mechanisms of keeping things repaired, you could keep things going indefinitely.

"Finding the Fountain of Youth / Where will UCSF biochemist Cynthia Kenyon's age-bending experiments with worms lead us?" by David Ewing Duncan, www.sfgate.com. May 29, 2005.
In principle, if you understood the mechanisms of keeping things repaired, you could keep things going indefinitely.