Menu Healthy Lifestyle Diseases & Conditions First Aid Symptoms Tests & Procedures Videos Definitions FAQs Intellectual disabilityUpdated: 2017-06-13OverviewAn intellectual disability is a below average intelligence level and set of life management skills present before age 18. Intellectual function can be measured with an IQ test. Life skills include certain conceptual, social, and practical skills.TreatmentsSpecial education and behavioral therapy can help a person live to his or her fullest. © 1998-2022 Mayo Foundation for Medical Education and Research(MFMER). All rights reserved. Terms of Use