Neuroscientists are confirming what car rental places already figured out — the brain doesn't fully mature until age 25. Up until this age, the prefrontal cortex — the part of the brain that helps curb impulsive behavior — is not yet fully developed.

Can your brain develop after 25?

It doesn't matter how smart teens are or how well they scored on the SAT or ACT. ... The rational part of a teen's brain isn't fully developed and won't be until age 25 or so. In fact, recent research has found that adult and teen brains work differently. Adults think with the prefrontal cortex, the brain's rational part.

At what age is the brain fully developed?

Under most laws, young people are recognized as adults at age 18. But emerging science about brain development suggests that most people don't reach full maturity until the age 25.