Every single adult needs to have an advance health care directive written, signed and in place. This includes your children, as soon as they turn 18. This includes you. This includes your parents.
Without an advance health care directive in place, you would not be able to access your child’s medical records, if they are unable to communicate permission. You would not be able to ensure your health care decisions will be made the way you choose. And your parents lose the ability to communicate their wishes and remain in control as long as possible.