Some U.S. states allow young adults to stay on their parents' health insurance beyond age 26, with age limits ranging from 29 to 31 and varying eligibility criteria such as being unmarried, a student, or a military veteran. Federal law mandates coverage until 26, but state laws may extend this. Disabled adult children may remain covered indefinitely in 17 states if specific conditions are met. Coverage extensions usually apply to fully insured group plans, not self-funded ones.