Does the adult human brain make new neurons? · Grey Matter

Possibly, in one place, and how much is disputed.

Does the adult human brain make new neurons?

Possibly, in one place, and how much is disputed. Rodents keep making new granule neurons in the dentate gyrus of the hippocampus throughout life, and carbon-14 dating of human hippocampal DNA suggested about 700 new neurons per day in each hippocampus in adults. In 2018 two studies looking for immature neurons in post-mortem human tissue reached opposite conclusions, one finding them into old age and the other almost none after childhood, and differences in tissue handling and patient groups explain part of the conflict. Either way, the number is tiny next to the brain's 86 billion neurons, and almost all adult change happens in synapses.