Since 1974, the SSI program, under Title XVI of the Social Security Act, as amended,4 has provided benefits to low-income blind and disabled persons-including adults and children,5 4The SSI program was established by Pub. L. No. 92-603, 301, 86 Stat. 1329, 1465 (1972), and became effective starting in 1974. as well as certain aged individuals-who meet financial eligibility requirements and the definition of disability."