Most of us have thought our brains stop growing before age 20. Well, researchers at the US Department of Veteran Affairs reported that that's true for the brain's gray matter. However, it's another matter with the white matter of the brain. It continues to grow until around age 48.
The gray matter came be thought of as a computer while the white matter is the high speed internet lines that connect your computer with all others on the planet. That certainly makes our brain much more powerful than we've thought before.