Nerve fibres of the parasympathetic nervous system arise from the central nervous system. Specific nerves include several cranial nerves, specifically the oculomotor nerve, facial nerve, glossopharyngeal nerve, and vagus nerve. Three spinal nerves in the sacrum (S2-4) also act as parasympathetic nerves.
The word longevity is sometimes used as a synonym for life expectancy in demography - however, the term longevity is sometimes meant to refer only to especially long-lived members of a population, whereas life expectancy is always defined statistically as the average number of years remaining at a given age.
In the past decade, longevity research has become a legitimate academic pursuit for molecular biologists. The Immortality Financiers: The Billionaires Who Want to Live Forever Adam Leith Gollner August 19, 2013. Perhaps the happiest result of her longevity has been to force her son to get himself a life. To the Queen, on Her 83rd Birthday Robert Lacey April 20, 2009. Known for its longevity, the longest game of Monopoly lasted for 70 straight days, according to Parker Brothers.