That viral claim that your frontal lobe “isn’t fully developed until 25” turns out to be more myth than milestone. Early brain scans showed that gray matter changes dramatically through the teen years, and because studies stopped around age 20, scientists estimated development might wrap up in the mid-20s. But newer, massive brain-imaging research paints a different picture: key wiring and network efficiency in the brain continue evolving into the early 30s. ...read more read less