I'm not quite 60 and I have them.

I think it's important for anyone who has a preference of how his or her affairs will be arragned if he or she is unable to communicate to make the proper arrangements.

I DO have a preference and I'm made my wishes know in writing.  I'd recommend that you do to.

A living will (also known as an advance medical directive) is simply a statement of your wishes -- your wishes for the kind of medical intervention you want (or don't want) in the event that you become terminally ill and unable to communicate.

Most states have living will laws that define when a living will goes into effect.  Living wills may, unfortunately, be subject to interpretation. Different institutions, different doctors, and different family members may arrive at different conclusions.

A patient's wishes are taken very seriously.  An advance medical directive is one of the best ways to have a say in your medical care when you can't express yourself otherwise.  You might also want to name a trusted friend or family member to be your healthcare advocate (or proxie).  You increase your chances of enforcing your wishes when you have someone speaking on your behalf.

You can name a person via a healthcare proxy, or by assigning a medical power of attorney. You sign a legal document where you name someone to make medical decisions on your behalf in the event that you can't do so for yourself.  A healthcare proxy applies when you're incapacitated, not just when you're terminally ill.

I rest easier knowing that I've chosen someone I trust to understand important medical information regarding my treatment, make tough decisions, and keep my best interests and wishes in mind.  I suspect you will too.