At age 90, my father spent the last year of his life sitting in a wheelchair, not knowing who he was, having his diapers changed, in constant pain.
Many times when he was younger he had said to me, "If I ever get like that, just shoot me". The problem was that when he actually did get like that, if I had helped him end his life I would have probably gone to jail.
I remember talking to the woman from hospice a few months before my father finally died. I said "If we kept a dog or a cat alive in this condition, we would be considered cruel, crazy or both. If we don't keep a human alive in this condition, we risk jail." She looked around to see that no one was listening, then agreed, then started telling me horror stories.
You can't expect someone else to end your life for you. You will probably need to do it yourself, or just sit and suffer for a few years and then die slowly. If you want to avoid that you will have to kill yourself.
The problem is knowing when to do it. You need to do it while you are still able. Once you are in a nursing home stuck in a wheel chair you will not be able to do it. On the other hand you don't want to do it too soon. You might miss out on some good living.
