If We Escape All Major Diseases, Neurodegeneration And Respiratory Failu...

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Neurons were transplanted from mice to rats, and the mice neuron lived twice as long as the mice. The researchers believed that if transplanted into even longer lived animals they'd live even longer potentially indefinitely. Likely same for human. But the loss of respiratory reflex as cause of death in elderly was found in animals, and likely applies to humans too.

That is if vascular and support glia cells for neurons were kept youthful it is likely this would reduce rate of neuron death, and might allow for far longer neuron average lifespan potentially extending into two centuries or more.

That said it is true that for a real solution we do need central nervous system regeneration stem cells.

Neuron Lifespan quotes and research

With neurons, nature developed biological immortality at the cellular level, but the animals needed to die to make way for the new generations, to allow for increased evolvability, or evolution rate, of the species.   Even in lowly rodents the neurons are capable of vastly outliving these short lived mammals.

“Neurons do not have a fixed lifespan,” says Magrassi. “They may survive forever. It’s the body that contains them that die. If you put them in a longer-living body, they survive as long as the new body allows them to. It increases our hope that extending lifespan will not necessarily result in brain depleted of neurons.”

https://www.nationalgeographic.com/science/article/neurons-could-outlive-the-bodies-that-contain-them

https://www.pnas.org/doi/10.1073/pnas.1217505110