My wife, 76, had a superior memory all her life but it has declined over the past 4-5 years and is now out in the open between us. She recognizes the decline but sees it as something she can overcome by exercising her brain (to which she refers regularly).
Her main symptoms are loss of short-term and long-term memory. She doesn't remember any of the trips we have taken, has lost familiarity with the streets and stores in the town where we have lived for over 50 years (though she is relearning gradually), uses generic words for specific ones (she might call a kitchen cabinet a closet) and asks me to repeat the date and time of my doctor's appointment 3 or 4 times.
Our two daughters are adamant that she should not be driving for safety reasons, even with me as a passenger. She has gotten lost a couple of times, cell phone to the rescue. Otherwise she is a very careful driver, always has been. We went out recently so she could practice (which she insists is the key to solving her problem of navigation) and she handled the car well but had me confirm which way to turn before reaching every intersection. This was a drive to each of several friends' homes.
She has a mild form of epilepsy (never any blackouts, just momentary "tingles"), is on medication and has been episode free for 3 years. When it was first diagnosed she was prohibited from driving until she was episode free for 3 months and hated this restriction. To have that restriction in place again would be devastating as, again, she thinks she just needs to practice more (to know her way around).
How will I know when she is unsafe to be driving? Again, the girls think it's pretty much now. She has been diagnosed with mild cognitive impairment but not dementia so would there be a legal liability if she got in an accident?