We should accept their wishes and not put our feelings in their way. Learn from them and try to appreciate why they are so accepting of their death. Be with them when asked. Celebrate the end of another life and the experiences gathered while on Earth. Use this information to prepare yourself for your ending days.
Death is a part of life.
Share it as you would any other aspect of living. When your turn arrives, embrace it fully as the start of your next eternal adventure. Last time, I mentioned I would be working on understanding my father and the lifeplan he is living. Trying to understand his point of view, seeing life from his perspective and trying not to force my way of thinking on him. I kept reminding myself that this is his plan not mine.