It seems clear that both aging and cancer are at least in part due to the accumulation of mutations in individual cells. Seen in the abstract, in terms of information, this is surprising. Our genetic information, after all, is massively redundant; mutations aside and ignoring a few special cases, every cell contains a copy of the same genotype. All a cell has to do in order to identify a particular sequence as a mutation is to check with two or three of its neighbors and see if they have it.
This suggests a possible strategy for life extension. Once our technology is good enough—not, unfortunately, any time soon—create some mechanism to exploit the redundancy, some way of identifying mutations by majority vote and eliminating them.