'nough said. Me thinks.
Your hair and your nails are comprised of your DEAD cells. Therefore, neither one can be considered “Healthy” by any measure.
Birthdays are a way to measure LIFE and not DEATH. That being said, you do not have birthdays after you die. You may have an anniversary of your death but you cease having birthdays upon death.
That's all I have so far. This list may change at any point.
That is all.