Here's the deal. I am not old, not even close. Yet I have a legal document in my possession that many people who are 3 times as old as me do not have.
An Advance Directive is a legal document that lists and a health care agent as well as your wishes should you become unable to do so. I have pretty specific wishes that I really want carried out, and don't want it to be left to chance.
They then get filed with the Vermont Advance Directive Registry so that no matter where I am my wishes can be followed.
I urge you to do the same within your state.
Links for Vermonters
Vermont Advance Directive Registry - http://healthvermont.gov/vadr/
Vermont Ethics Network - http://www.vtethicsnetwork.org/