People in their twenties have an annual chance of dying of about one in a thousand, so effective anti-aging would give an expected lifespan of about a thousand years.
Based on the rates of various types of accidental deaths, you could extend that quite a bit by avoiding dangerous drugs and and living in an area where you're unlikely to get shot. If we figure out really safe self-driving cars, that'll make a big difference too. In much of Europe you can already get the same effect by taking public transport everywhere. Air travel is quite unlikely to kill you.
And some cells do not reproduce (neurons, etc), so you have to keep them in good shape, except this is impossible. For example 1/3 people are infected with Herpes virus which stays in their neurons.
In addition some cells reproduce only a few times, often only during youth.
No some cells never reproduce, for example motor neurons.
> "I imagine that if aging can be reversed new cell growth could also be stimulated."
I have a hard time to imagine how to replace a up to one meter/yard long cell with sometimes hundred of synapses which is surrounded by cells such as astroglia and microglia that are equally important.
https://www.ssa.gov/oact/STATS/table4c6.html
Based on the rates of various types of accidental deaths, you could extend that quite a bit by avoiding dangerous drugs and and living in an area where you're unlikely to get shot. If we figure out really safe self-driving cars, that'll make a big difference too. In much of Europe you can already get the same effect by taking public transport everywhere. Air travel is quite unlikely to kill you.
https://www.iii.org/fact-statistic/facts-statistics-mortalit...
Put all that together and a 10,000-year expected lifespan looks pretty achievable.