A living will expresses a person's exact wishes for medical care if he or she is unable to communicate with physicians. But since middle-aged individuals, including many Seattle residents, still feel very young and healthy, such end-of-life documents would seem to be something that people in their middle ages wouldn't be too concerned about. With that in mind, Washington residents may be interested in a recent poll that found that 64 percent of baby boomers, those born between 1946 and 1964, said they don't have a living will.Yet, regardless of age or health, carefully spelling out one's end-of-life wishes can be a good idea for anyone. A living will enables individuals to say just how much or how little they want in medical treatment if they are in a state in which they cannot speak for themselves. A living will can also spare families otherwise painful decisions regarding the application or withdrawal of medical treatment.