Do Older Brains Make New Neurons or Not?

Neurons in the brain. (Credit: Andrii Vodolazhskyi/Shutterstock) One of the most basic things our bodies do is make new cells. It's what allows tissues to grow and heal, and allows our bodies to continually rejuvenate themselves. When it comes to cellular replenishment, one of the places researchers are most interested in is the brain. The formation of new brain cells is of critical interest to researchers studying everything from brain injuries to aging to mental illnesses like depression.