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Well they've already reset an entire optic nerve, I wouldn't say resetting neurons is decades behind. The main issue would probably be resetting without making the neurons lose its connections.Because the mechanisms for resetting cell health and outright extending their maximum lifespan are vastly different. I've heard all of the top longevity guys talk about how these are massively different problems, and that we have much more insights into prolonging healthy cell span rather then actual lifespan.
If I'm not mistaken, the main challenge will be neuron/brain cells. We could probably figure out ways to extend the human body for hundreds of years, but research into how to reset and prolong neurons is decades behind.
And yes curing aging is more than just resetting all the cells in your body. This explains what we need to fix in our bodies to reverse aging. https://www.sens.org/our-research/intro-to-sens-research/
Most of these approaches are already in preclinical stage or clinical trials.
As for prolonging lifespan, we have already been able to do that in mice. There are dog aging projects going on right now which use gene therapy on dogs which may prolong their lifespan as well. It's only a matter of time before this research translates to humans as well.