I know what you are saying but both of my elderly parents have dementia, and they've never headed a football in their life.
In her head my mum went for a really long walk with the carer the other day and it frightened her so she asked to go home. It really upset her. As I say, it's in her head, as she hasn't moved, let alone walked, since a massive stroke in 2018.
My dad regularly phones in the early hours asking for help as the carers have locked him in a cage. He's tuned sideways in bed and seen the bed bars that stop him falling out of bed, so he thinks it's a cage. Anyone that has a relative with this terrible illness will tell you that you get dragged down so low yourself that you start to question the value of life itself.

I've told my parents that if they outlive me after putting me through this I'll come back and haunt them.

At the moment, they do both know who I am, which is one saving grace, but for how long who knows.