Lol the brain doesn't magically stop developing at 25. Neuroscience doesn't assign an exact universal age at which the brain stops developing and the studies on this matter report conflicting results, with some reporting development of the prefrontal cortex into the 30s and 40s.

http://www.telegraph.co.uk/news/health/news/8204782/Brain-only-fully-matures-in-middle-age-claims-neuroscientist.html

Your statement is equivalent to saying that everyone reaches puberty at 13.