How does the Social Security Administration define “disability”?

“Disability” is defined by the Social Security Administration as an  “… inability to engage in substantial gainful activity by reason of any medically determinable physical or mental impairment [or combination of impairments] which can be expected to last for a continuous period of not less than twelve [consecutive months] … taking into account the individual’s age, education and work history.” 42 U.S.C. sec 423 et al; 20 C.F.R. 404 (emphasis added).