@mtdt757
I started the conversation with my husband before he stopped driving, telling him his judgment was off and he was veering off course frequently. He would not be convinced that he needed to stop, and thought he was just fine.
The way it ended was horrible, and we and the other driver nearly lost our lives (so, no, he wasn't fine to drive anymore).
My husband has anosognosia along with his frontotemporal dementia, so the lack of self-awareness makes it challenging to convince him of anything.
The best advice I read from folks on this site is to have their doctor take away their license. Alternatively, you can anonymously report a person to the DMV, and they send a letter to them requesting they come in to take a physical driving test.
Good luck!