My dad has dementia. It started with repeating himself, and also asking questions that he had recently been told the answers to.
One day he couldn't do the taxes anymore. (Prepare the info. for the accountant.)
He goes to the neurologist every 3 months and at some point the neurologist restricted him to only driving with my mother, and then later took away his license. The fact that it was done gradually, with reason, and by the doctor, really helped. The doctor explained that even if he was hit, an insurance company could tell he couldn't remember everything and blame it on him, so he shouldn't drive. That was a good reason, as it was not related to his physical ability to drive, which was still in tact, I think.
More recently, after my mother fell, she drove my dad to the bank but stayed in the car because getting in and out was hard for her. He had a two part task for him to do in the bank. He did not do it right.
Also, she dropped him for a very long dentist appointment. He did not wait for her where he was supposed to. Eventually she found him.
It seems like she figures out what he can't do once something doesn't go well. I'd like it to be before.
Now sometimes my dad doesn't remember where to put something back, or where something is. They have lived in that house 50+ years.
One problem with the neurologist is that he asked my dad about the election and he could answer, so the doctor didn't see a difference. But there is a difference. So I told my mother to make a list before each appointment of the changes she notices. And to bring the one from the previous time and her up to date notes to the appointment so she and the doctor can look at the changes.
Isolation has been a problem for my mother. She really misses intelligent conversation. Most of their friends have died. On the other hand, she craves time in the house without my father.
Gradually she has found a few things that work. She has her good days and her rough days. I'm trying to get her to contact an agency so she will have someone who already knows them, to call if something goes wrong and they can't manage for a while.
My brother is visiting them now, so I will get a report soon.
I'm an 8 hour drive away. Luckily, they have a nice neighbor next door, who can help in an emergency.
Luckily, my dad is pretty happy and actually seems less stressed now. It was hard for him when he first got the diagnosis. However, he get very anxious in certain situations.
Signs with my grandmother. She blew up the microwave when she put metal in it.
They got someone to live with her after she waited outside to be picked up wearing everything including dark pantyhose but no pants. Once she needed constant watching she went into a small family run care facility in a house a mile from my parents. Some more signs-she became very anxious, would 'hide" her purse, and then couldn't find it.
Would eat a huge amount, forgot she ate, and then eat some more.
For my friend's mother, first she almost never left her house. She didn't go to her granddaughter's wedding, even with a ride. That would have been a big sign for me.
Then she kept flunking her driving test. She had her license taken away and got an I.D. card. The woman who was helping her a bit called my friend and said the mother thought she could drive with the I.D. card. The friend moved her mother to his house fairly quickly after that. And gave the car to his kid.
My mom had a cancer scare and that's when my brother and I started realizing if something happened to her, my dad couldn't spend even a night alone.
Hope this helps, and good luck.