These two documents are constantly confused, but they do different jobs — one names a person, the other records your wishes — and together they take enormous pressure off whoever ends up speaking for you. For solo agers, they're arguably the two most important pages in the whole planning stack, because there's no spouse the hospital will default to.
Health care proxy: who decides
A health care proxy (also called a medical power of attorney or health care agent designation) names a specific person to make medical decisions on your behalf when you can't communicate. Your agent can talk to doctors, consent to or refuse treatment, and choose facilities — but only while you're incapacitated, and only within any limits you set.
Choosing the person matters more than the form. Look for someone who is calm under pressure, willing to advocate against a room full of professionals, geographically reachable, and genuinely willing to honor your wishes rather than their own. A close friend often fits better than a distant relative. Name at least one backup agent, and ask both before signing.
Living will: what you'd decide
A living will (advance directive) documents your own wishes about end-of-life and life-sustaining care: resuscitation, mechanical ventilation, feeding tubes, dialysis, and comfort-focused care. It applies regardless of who is making the call, and it's the document doctors reach for when no decision-maker can be found quickly.
Why you genuinely need both
Without a living will, your agent has to guess your wishes from memory, under grief and time pressure — and other people may second-guess them. With one, your agent is confirming a document rather than reconstructing a conversation from years ago. Without a proxy, meanwhile, even a perfect living will can't answer the hundreds of smaller decisions it doesn't cover. Add a HIPAA release so your key people can even receive medical information in the first place.
Making them valid and findable
Every state has its own forms and witnessing or notarization rules — check yours in our state legal directory. Then distribute copies: your agent, your backup, your primary doctor, and your own emergency folder at home. A perfect document locked in a drawer no one knows about protects no one. Revisit both documents after any major life change.