Use it or lose it- mobility & the brain.

Hi e1-
Asking for as many replies as possible please on this :
My mother does not have Alzheimer’s or dementia, she has selective for the most part. My mother is not active although she does have the physical abilities of mobility with her walker if she wanted to be active and independent in some things. Over the years I have learned to know the difference when my mother is truly having a brain fog or if she’s conveniently milking it like a farmer at 6 am. I have come up with a theory about mobility decline and memory loss and how they could relate to Alzheimer’s and dementia. My mother is only 72 yet she has acted like a 109 year old bed ridden invalid for over 15 years. She is very much alert in general but I’m noticing more frequent episodes of her not remembering basic routine things like functions on the remote which she is The guru regarding its operations because Her Chair and The TV are her world and all she does. She has become so focused on Judge Judy and the news that she totally has lost interest in anything else except food. Is complacency or use it or lose it a factor in her forgetting how to use the remote? Basic simple things are what she truly has lost the ability to do; but she has no problems with being able to nit pick me, know status of finances and the things she wants. The lady across the street is mom’s age and she is still driving shopping maintaining her home active with her church etc; mom also has a friend who is 84 living independent and still hiking the Grand Canyon! I understand everyone is different, but those two ladies are up and at ‘em and living life and no signs of brain fog; mom exists in Her Chair with nothing beneficial or stimulating to her mind entertaining, no, passing time and she soon will not be able to grab her own behind with either hand. So, does immobility and lack of stimulation contribute to the symptoms of Alzheimer’s and dementia as well as genetics do? Or even more than genetics? Socializing and fellowship in person with people seem to keep the brain in better condition. My mother chooses to isolate herself from life; I wonder what the statistics are for folks who get isolated unwillingly and labeled with Alzheimer’s or dementia? Unfortunately, a lot of times, grandma and grandpa only hear from family on birthdays and Christmas; they move to slow or are “too old and wouldn’t want to do this or that anyway” for the grand kids to take them out and about. Also, youngsters lack life experience to “get it” regarding older people that’s just life. I bet grandma and grandpa light up on birthdays and Christmas even when they seem like they’re losing it the rest of the time... thanks for reading and replies.
susan xoxoxo