The World Health Organisation defines health as "A state of complete physical, mental, and social well-being not merely the absence of disease . . .".
Quality of Life as an individual's perception of their position in life in the context of the culture and value systems in which they live and in relation to their goals, expectations, standards and concerns.
I totally agree with timberwolf - "once i do not recognise anyone, cannot move out of my bed and need my backside wiped then please come over and put me out of my existance"