The longest living cells in the body are brain cells

This statement is correct. Neurons (brain cells) can indeed survive and function for a person's entire lifetime, making them among the longest-living cells in the human body. Unlike most other cell types that regularly undergo cell division and replacement, most neurons are post-mitotic, meaning they don't divide after formation. While some neurons do die with aging or injury, many cerebral cortex neurons persist from birth until death, potentially living 80-100+ years. This longevity is why brain injuries are so devastating - lost neurons typically aren't replaced.