happiness is a measure of attitude and outlook towards
life.
you may be living in a sh!thole, but u're really positive and so u
rate 11.
or you might be having the most luxurious life, with a good family,
lots of friends etc.. but you just want to have the moon, and you'd
rate 1.
but its human nature to always make comparisons to the better and
thus no one can reach 10. maybe momentairly when u strike 4d or
smt.. but def not long term.