@Lillixyng in some cases but not all. My grandmother ran the family farm and business during the war years, which included several tied cottages and payrolls. She was an accomplished horse woman (related businesses), drove a car before the war and many a tractor. She worked until she was 72.
She was a quiet but very intelligent and well read woman and spent time at her London home until she was in her early 70s.
Then the early alzheimers started, it was memory and repetition at first. Which worsened, then forgetting how to cook and make a cup of tea, accusations of theft against my dgf and mother. She went out to the shops until about 75 and then needed help because she forgot what she went for or the way home. Shortly after she forgot who we were.
The breaking point was when two policemen brought her home in her nighty at 2am.
To give grandad a break she started to go to respite at a local nursing home two days a week and it wasn't long before she started escaping/wandering out.
The next stage was two weeks in five in a geriatric specialist MH hospital. At that stage she was still walking, endlessly, and could feed herself and drink from a cup.
When she was 81 she was given a place at a specialist nursing home. When she arrived she was still mobile and could feed herself. She was a strong fit woman who barely drank and never smoked. She had no underlying illnesses. No illnesses, no arthritis, no heart conditions, etc.
Her illness continued for another 4.5 years. Not many people actually die from Alzheimers, most die with it. She lived for 4.5 years because mother and grandad ensured there were daily visits. Mother did her hair and her nails and they spent time with her. She forgot how to walk first, doubly incontinent of course because that is forgotten too, then they forget hunger and thirst and how to eat and drink. She drank from a sippy cup with help in the last 18 months and was fed pureed food because they forget how to chew. In the last stages they forget how to swallow.
For the last year she had a special vibrating bed, bought by the family, to prevent bed sores. When she died she was 4.5 stone, aged nearly 86. She lived due to the devotion of her family and her original strength.
Had she seen an animal suffer as she suffered she'd have shot it.
Having read that story, do forgive me fir disagreeing with you. People often have no agency over their decline and death and others need an empathy transplant to be decent.