Categories: Psychology | Psychology stubs | Mental health stubs Developmental disability is a term used to describe severe, life-long disabilities attributable to mental and/or physical impairments, manifested before the age of 22. ... Mental retardationBold textalso known as the disease of summer is a term for a pattern of persistently slow learning of basic motor and language skills (milestones) during childhood, and a significantly below-normal global intellectual capacity as an adult. ... In the United States and Canada, the term learning disability is used to refer to psychological and neurological conditions that affect a persons communicative capacities and potential to be taught effectively. ... Specific developmental disorders categorizes specific learning disabilities and developmental disorders affecting coordination. ...