Thanks God that the human life is getting longer with modern medicine. Many of your parents, even grand parents are alive; and also, touch wood, they are healthy. Let them never be absent. Of course, depending on their age; there are a number of health issues for all of them, but you mobilize all of your assets for them. Do not give up!
You will all agree that when health is concerned, the most important thing is mental health. It is what a great pity to see those that once you were proud of and fascinated by the light of their mind; getting demented. In my recent book, you can find the answers to all your questions about this problem. Do not forget even though they might!
I just want to emphasize the most important point here: Do not ever think that there is nothing that can be done to cure your parents, who you think might have Alzheimer’s disease; in other words, dementia. One of each seven such patients can be restored to the previous state with a simple operation! Mom, Dad; do not forget me!