thanks
Its true there is very little regeneration of neurons (the brain cells you're probably thinking of, that send signals) after the original setup. however, there is another whole segment of brain cells called glial cells, which back up the neurons in various ways - removing chemicals, maintaining the barrier between the brain and the blood etc.
A big part of growth in the brain and nervous system is the process of myelination, in which the glial cells wrap the neurons in what is basically insulation. This is the white stuff (mainly) in white matter of the brain. It lets signals travel more clearly and faster, and the loss of this myelin is the main source of disorder in the disease multiple sclerosis. Myelination is a process that continues well into the teens, and may account for the gain in brain mass.
and can i have some proof of your claim
thanks
