Neural fibers and synapses continue forming and rewiring until death

Evidence

One of the major characteristics of the nervous system is, without a doubt, its plasticity. The brain cannot be considered to be a network of permanently established cables, with cerebral aging being the result of an increasing number of units in this circuit becoming disconnected from the network and going out of operation. Although this has not positively been demonstrated except in a few experimental models, we can assume that every day new fibers are growing, synapses are becoming undone, and new ones are being formed. These changes in the neuronal … landscape mark our capacity for adaptation, our capacity for learning and improvement, which continue until an advanced age, and in fact until death. — Catherine Malabou, What Should We Do with Our Brain?, 99