 thirtysomething million should they be exceptions  there are over thirty million people in the us with disabilities or functional limitations of which a major cause is aging and this number is increasing an examination of the role of human factors in addressing this population is presented which would include both special designs for disability aging and the incorporation of disability aging into mainstream human factors research and education trace research development center college of engineering university of wisconsinmadison http tracewiscedu docs 30some 30somehtm 