Sorry to hear that. My dad started Alzheimer's Disease about 30 years before he died, after three heart attacks within 18 hours.
Aaaah.
That must have been very tough.
Your mum must have been quite young and vital. I suspect most mothers have to do more because their husbands don't.
Actually, she died at the age of 88, (in December 2018), and had suffered from dementia for the best part of a decade prior to that.
In truth, I believe that she never fully recovered from my dad's death in 2005 (cancer and strokes, for him), and they both had cardiac stuff, as well, stents and a by-pass for him, stents and a pace-maker for her - they had been married for a month under 45 years when he died.
I date her decline from around then, but she had been vital, and loved to laugh, and loved books, theatre, travel, politics, history, sports (she had been an excellent sportswoman in her youth); she was terrific company, and - as adults - we were great friends.
Fortunately, her character (which was sweet and funny) remained intact, right to the end, (we cared for her at home) as her dementia - which robbed her of her (always active, fiercely intelligent) mind and memories - progressed.
My dad never really tried. His father seemed to develop into Alzheimer's after building a new room onto his house and falling off while putting a roof on it. At 98 years old, he still thought that he was 92, and my dad couldn't (didn't try to) understand. "Why does he keep asking me the same thing again and again?" he would ask me.
That sounds challenging, to put it mildly.
We can't change the past, but if we share our stories with people at the beginning of such circumstances, we can save them effort and heartache.
This is true.