I recall listening to a gerontologist on a radio talk show. One thing she said stuck with me: STOP paying for things you think will make your life EASIER!!
Whether services or implements, the more you rely on ease-of-living methods and items, the more ground you lose toward your end. The more autonomy you retain and insist upon, the more motivated you are to do things for yourself, and the more robust and strong you keep your body as a result of doing all these things (better balance, more core strength, stronger grip, and a stronger cardiovascular system), the longer you will enjoy life, be switched-on, see things, enjoy the outdoors, and retain your cognitive function.
My 95 year old dad (will be in three weeks) just passed his automotive licensing medical. He passed his driver's test at 94 last year, and I hope he does again. Sadly, only five months ago he wanted assisted death and had started the paperwork. Reason? He had several falls, although they were related to low sodium. He had fractured a vertebra and was in real pain, but also immobilized...or all but. He felt his life was over. Now, with his mental toughness, and his ability to claw himself back up the muddy slope, he is walking again, and about to have a driver's exam so he can get to his beloved Spanish classes (he has been fluent all his adult life, but enjoys the friendships of those who have the intellectual drive to take up a language as they age), and also his gospel singing.
You mentioned your dad had low sodium. How did they turn it around? Did he take medication? This just happened to my husband and am wondering what the options are.