Personally I see great advances ahead but do wonder if extending lifespans will result in better quality of life for longer otherwise what's the point?
In particular: cells accumulate genetic damage over time. Each cell receives a different set of mutations. So it's not just the problem of correcting an inborn genetic error across all cells, it's the problem of specific patches for every cell in the body.
If you can't do this, I don't care what other advances are made, the cells (including neurons which aren't replaced) will eventually stop working.
