Been with Mom (91) for 5 years now and just curious, why she gets so angry and upset when she's wrong?

if theres dementia / memory illness involved the last thing you want to do is point out her mistakes , as pam said . you'll only become the enemy . her thought process is warped , she believes shes right ..

I think many people do that no matter what their age.... it's just human nature. My significant other cannot admit when he was wrong about something, so he gets defensive. Come to think of it, I do too, at times.

Old age is not for cowards. The angry phase comes around as the patient is still well enough to know they are losing control. My MIL still insists we are the ones with faulty memory. We simply redirect the conversation to something more pleasant. Try not to point out that she was wrong.