Yes, if you have alzheimer’s/dementia. Otherwise, no. Chavez is right about how those conditions affect behavior. As for “assault”, you can’t prove the requisite intent.
http://radaronline.com/videos/george-h-w-bush-spanks-teri-hatcher-video/
G.H.W. Bush groped actress Teri Hatcher back in Feb 2007, when he wasn’t in a wheelchair, and it was caught on video.