Just look back and think of all the good things you've done/achieved with your life. Look at all the laughs you've had, even the downs that you've overcome. You can't measure life but you can look at how much you've done with your life.
If you're feeling blue list five things you have enjoyed in the last 24 hours- use your senses too.
Then I think about the people I love, those I can count upon and those who love me. There are more than you think.
But I really think the best way to 'measure life' is just to get on with it, be open to new experiences- good or bad- and live! What's right for one person is not necessarily right for someone else.
measure life? its endless. its as long as you make it!
dont be stressing about it, dont count the days. live like its a dream, and dont waste time pancing about life.