Intellectual disability.

Developmental retardation, developmental disability.

Developmental disability can be retardation. A developmental disability is a mental/physical impairment onset before the age of 22. A developmental disability affects three or more of daily living activities like independent living, learning, mobility and self-care. Examples of dd are not only mental retardation, but cerebral palsy, autism and Down Syndrome.

Mental retardation is a developmental disability that first appears in children under the age of 18.

An acquired disability is a disability that a person develops later in life due to illness, injury, or other external factors. A developmental disability is a disability that originates before the age of 22 and affects a person's physical, cognitive, or emotional development.