How about adult neurogenesis in humans?

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If you had noticed, for most of the 20th century, there was a general consensus that once the developmental period was over, brain cells could not renew themselves. But, over the last two decades, some evidence gradually accumulated for the capacity of new neurons to be born in two properly defined locations in an adult's brain - the dentate gyrus of the hippocampus and the sub ventricular zone.
The hippocampus plays an important role in memory and learning, and this adult DG neurogenesis has not only been implicated in memory but has also led to ideas that it could be harnessed to treat neurodegenerative and neuropsychiatric disorders.
Hippocampal neurogenesis not only occurs in adult humans but also it does not appear to decline with aging. This was the view of Boldrini et al. But, don't you feel that if neurons are born in human adulthood, they may be relatively far. And don't you feel that adult neurogenesis declines with age in most species that were examined and fascinatingly, they might might be absent in whales and dolphins, also notable for good memory power and longevity, so perhaps, we should be focusing more on neurogenesis occurring in adolescence, trying to understand whether juvenile newborn cells can help treat neurological disorders and whether this period can be extended.
  

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