So the vast majority of posters on here intend/would want to kill themselves.
I think you are missing out the end of that first sentence, where we would say "in certain circumstances".
Most people in old age fortunately don't reach that stage.
In reality, how many people actually do that in old age? Very very few.
Well of course not, because there currently isn't a legal, or comfortable way of doing that, unless you are rich enough to go to Dignitas and well enough to travel. When the laws are changed, so that people have a realistic option, I think you'd find more folk would.
Because whatever we think when we're well, we're primed to stay alive, even when we're old and life isn't great.
I don't want to claim to be speaking for anyone else, but I'm not talking about when I've 'slowed down a bit in old age' or 'when my hearing isn't what it was' or 'when it takes me longer to do some things'. I'm talking about if I have a terminal illnesses, being given the choice to be able to have an injection or drink a cocktail of drugs when I am ready. Particularly if I have a degenerative condition and am slipping into a place where I can't talk, I can't swallow, and I am incontinent. I would like the option to choose to end my life perhaps 3 months earlier than it will end anyway with medical interventions keeping me alive. I'd like the option to know I am going to be able to make that decision when it is right for me, and not have to wait to starve to death or some other long, drawn out period where my loved ones watch me suffer because refusing food or refusing particular drugs is the only way we are legally currently allowed to choose to die in the UK.