A person has a learning disability when their ability to learn new things (intelligence) and cope independently (social functioning) is reduced by a large amount compared to most other people’s abilities. Learning disabilities start before adulthood and have a lasting effect on development.
Problems with intelligence or social functioning which start later in life due to ageing, illness, or injury, are not learning disabilities.
It’s also important to know that a learning disability is not the same as a learning difficulty (like dyslexia). A learning difficulty affects specific areas of learning, but a learning disability affects overall intellectual ability.