http://www.alzscot.org/information_and_resources/information_sheet/1841_dementia_and_deafness_-_what_you_need_to_know

- was wondering if sign language continues after illness.

Found this is new territory - signs of dementia were mistakes in daily living, using older signing for words that have more modern signing, withdrawal and anxiety. Hearing doctors do not know how to diagnose deaf people.

http://www.nursing.manchester.ac.uk/deafwithdementia/PublicationsDissemination/laysummarydwdBSL.pdf