Mama and I years ago filled out "Patient Advocate" forms. Basically that form tells an attending physician who can make medical decisions in your behalf if you are not able to do so. We obtained the forms from our family doctor, followed the instructions, and have them on file, and have given copies to our designees. The forms in Michigan, are free and do not require a legal rep to sign them.
In the body of the form you indicate what kind of care you want such as life support decisions. Your designee then instructs the medical profession of your instructions.
I have three questions for you to answer in your comments.
1. Do you have Patient Advocate designee's ?
2. If not, when are you planning to do it?
3. Last question, do you have questions?
Friends of mine just lost a 39 year old son unexpectedly to a heart attack. No, you are not too young to die or to young to do this.