In that case, if cells in the brain are recreated rather than repaired and we lose memory, there would have to be a point where the brain is inactive and rebooting. That could be the termination point of life, where the human mind cannot think or remember. At least until that point, the human has remained - physically - at its peak and hasn't suffered the disadvantages of old age.
I actually just realised that this research reversed ageing is as close to Benjamin Button as humanity has actually gotten so far.. If the end process of the reversal is the death of a baby with little cognition of the mind, wouldn't it be better to just have life end at its peak and introduce a new life into the world?
And yes, it would likely be lifetimes before this 'technology' is completed to an applicable state.. IF it is at all possible. But for the mean time, would it be, at best, enough to regenerate limbs, heal wounds/injuries faster and spark the recovery of disabilities with this knowledge?