Today, as I was preparing to go see my 95 year-old grandma, he described her as "healthy". He has also referred to me as "healthy" on occasion.
By his definition, then, you are healthy if you:
- need to wear a diaper
- are immobile
- can't see
- can't hear
- are missing teeth
- can't feed yourself
- need a million pain pills
- need an MRI every 4 months
- have some of your brain missing
My point is that quality of life is important. It takes more to be alive than simply not being dead, although it helps to not be dead if one is to live.