5. Neurons: Built to Last a Lifetime
Unlike most cells, many neurons in your brain are designed to last a lifetime. These long-lived cells are responsible for storing memories and shaping your personality. While there are exceptions—such as new neurons forming in areas like the hippocampus—most brain cells are rarely replaced. This remarkable longevity helps explain why damage to neurons can have lasting effects and why neurodegenerative diseases are so devastating. For a deeper dive, visit NIH Research Matters.