confused elderly

adjective

social welfare
  1. old and no longer having mental abilities sufficient for independent living
  2. (as collective noun; preceded by the)the confused elderly
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012