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"(Medical Xpress)\u2014Replicative aging (also known as replicative senescence) causes mammalian cells to undergo a process of growth arrest dependent on telomeres (the shortening of repeated sequences at the ends of chromosomes). Neurons, on the other hand, are exempt from aging, and so the question of their actual lifespan has remained unanswered. Recently, however, scientists at the University of Pavia and the University of Turin demonstrated that neuronal lifespan is not limited by the organism's maximum lifespan but, remarkably, continues when transplanted in a longer-living host. The researchers accomplished this by transplanting embryonic mouse cerebellar precursors into the developing brain of longer-living rats, in which the grafted mouse neurons survived for up to three years \u2013 twice the average lifespan of the donor mice."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2013-03-neuronal-organismal-lifespans-decoupled.html>