re: #54 BeenHereAwhile

Is there a Hayflick limit?

Not if you rebuild telomeres so they never run out. More cell replication means more errors and more cancer though, so you need to repair more than the telomeres.
I may be wrong, but I expect that in a few hundred years of life everyone would get cancer as errors pile up over time.

As JC1 points out above, this isn’t going to roll back the clock, but built into a person from birth, it might keep people in their prime.