> "those cells reproduce at some point," No some cells never reproduce, for example motor neurons. > "I imagine that if aging can be reversed new cell growth

> "those cells reproduce at some point," 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.