When my son, Sam, celebrated his 18th birthday, I gave him (surprise!) his very own set of estate planning documents. They were not as popular as, say, a Land Rover, but they were definitely at the top of "my" list. Why? Because he was now an adult and I was now persona non grata.
In Being Mortal, an incredibly rich and revealing book about what people care about as they age, Dr. Atul Gawande described how impressed he was by the importance people placed on maintaining control of their lives.