People on the Autism spectrum may be an exception.  Some of these folks are genius level in music, math, coding and the arts.  Yet they end up in much different circumstances as adults.  This is based largely on their support structure and where they live.  For example in many developed countries these people are actively recruited for specific employment.  They live pretty normal lives with minimal support.  The same person who was not given the support and opportunities in a less developed part of the world may not stand a chance