From early adulthood onward, the number of neurons in the brain does not decrease much but the number of synapses steadily declines.

Question

Quizplus · Accepted Answer

While it was previously believed that the number of neurons in the brain decreased over time, research has shown that this is not the case. Neuron loss is primarily associated with neurodegenerative diseases such as Alzheimer's. However, the number of synapses, or connections between neurons, does gradually decline with age.

From Early Adulthood Onward, the Number of Neurons in the Brain