In many countries, the period of life expectancy is longer, and many middle-age children are taking care of their elderly parents. This can be very difficult because they will probably need somebody to be with them all the time.
Children can feel that they are losing their privacy.
If they decide to put their parents in a nursing home, they feel ashamed because theythink it is their duty to care for them as their parents took care of them when they were children. In my country, elderly parents usually stay with their children. Children become their caretakers. This is one solution, but this situation is hard because the children already have their own families and other compromises. Their sons' contribution is mainly financial aid.