RT Journal Article SR Electronic T1 The Social Challenge of Ageing JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP 102 OP 102 DO 10.1136/jme.7.2.102 VO 7 IS 2 A1 J Williamson YR 1981 UL http://jme.bmj.com/content/7/2/102.abstract AB