[wmnwmn]

Totally wrong from the get go. Cells do not use thermal energy to "ratchet" order out of chaos. That would violate the 2nd law of thermodynamics. Cells create order by using energy from an already-ordered source, namely the food you eat. This source is in turn ordered ultimately by exploiting a very high temperature differential, namely between the sun and earth temperatures. Usable energy can be extracted from differentials; it cannot be extracted from a heat bath at one temperature. But since we do have the virtually unlimited energy from the sun, and some other sources, we can lower entropy in a fixed region as much as we like. There is no physics barrier to repairing every single atom of aging damage in a human body.