Back when, after my late wife's demise, I visited friends, (older than me and both since deceased), in California. (The wife, on a previous visit a couple years earlier, had expressed her concerns about his mental faculties, but we dismissed them as simply 'aging'.)
This time, since I was experiencing problems with the 5th Wheel I owned at the time, in the morning he drove me to an RV repair facility and I made an appointment for later that afternoon.
He was to follow me down in his vehicle 'just in case' - at one point I noticed he did a right turn while I was going straight ahead. I proceeded to the appointment, got the unit fixed, and.......he never showed up....(he'd returned home.)
Later his wife told me that she said to him "Aren't you going to the garage to see if Nemo2's OK?" - she said he became quite indignant and claimed that he hadn't left the house all day!