... with the notable exception of (most) of your neurons. The only exception happens in the hippocampus which is involved in long term memory. (As a side note,

... with the notable exception of (most) of your neurons. The only exception happens in the hippocampus which is involved in long term memory. (As a side note, a reduced turnover of these neurons is associated with depression, but I don't know what's the cause and what's the consequence.) Some cells have a much higher turnover(almost daily). I think of the immune system and of some epithelial cells (especially in the digestive tract). Your ten years figure seems to be a reasonable median, but I don't have any data to back it up either.