My father is probably younger than you... He is also 58-59 year old.
There is such environment in the house that we have not discussed about what he wants. The biggest truth of life is that everybody has to die one day so is that mean every seriously ill patient should stop doing treatment for himself? I once heard fighting against disease is also Jihad. So what is wrong if a person is battling against the biggest enemy of his life who is constantly attacking him from inside out? If a 20 year old young kid is suffering from cancer, should he not go to hospital for treatment or should he just stay and await for his imminent death?
My father is sick but as I said the doctors had stopped giving him medication for his disease many years ago. But he was still as healthy as before for couple of years until recent past when he has suddenly become so weak that he cannot even walk anymore. He does walk after holding a hand of somebody when he is in courage otherwise it is getting difficult for him. So if you are weak and cannot walk properly, should you use a wheelchair/support or get yourself shot for quick relief of imminent death?
PS: The medication he is taking is all about restoring his energy.
I think if we go by your logic, there would not be old people around or if there are they would all be in healthy condition. The world is not so cruel I guess