The inability to engage in substantial gainful activity (SGA) by reason of any medically determinable physical or mental impairment that can be expected to result in death or to last for a continuous period of not less than 12 months. (Special rules apply for workers aged 55 or older whose disability is based on blindness. The 12-month requirement does not apply to SSI beneficiaries who are blind.)
Individuals are considered to be disabled only if their physical or mental impairment(s) are of such severity that they are not only unable to do their previous work but cannot--because of their age, education, or work experience--engage in any other kind of substantial gainful activity that exists in the national economy, regardless of whether such work exists in the immediate area in which they live, or whether a specific job vacancy exists for them, or whether they would be hired if they applied for work.
The SGA criterion does not apply to children under age 18 in the Supplemental Security Income program. The standard for them is a medically determinable physical or mental impairment that results in marked and severe functional limitations.
Monthly benefit payable to a widow(er) or surviving divorced widow(er) of a worker fully insured at the time of death, if he or she is (1) aged 60 or older or (2) aged 50-59 and has been disabled throughout a waiting period of 5 consecutive calendar months that began no later than 7 years after the month in which the worker died or after the end of his or her entitlement to benefits as a widowed mother or father.
A surviving divorced widow(er)'s marriage to a worker must have lasted 10 years before the divorce became final. Effective for benefits payable after December 1983, benefits are continued for disabled widow(er)s and surviving divorced widow(er)s who remarry after the age of first eligibility for benefits.
Effective January 1991, benefits may be payable to a deemed widow(er), including a divorced deemed widow(er). A deemed widow(er) is a person who entered into an invalid ceremonial marriage in good faith.