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It seems the same for life generally a fly may live 2 weeks. larger a cat/dog maybe 15-18 years a human 70ish years an oak tree maybe 250 years.Larger seems to have a link to longer...
No, you can grow new cells by studying a subject craving a lot of thought. It's experimentally proven although it's about specific parts of the brain as I remember it. It may be that there are areas that won't be able to do this, but it's not true of the whole brain.
The evidence for neurogenesis is mainly restricted to the hippocampus and olfactory bulb, but current research has revealed that other parts of the brain, including the cerebellum, may be involved as well.