"Imagine that you are one hundred and ten years old... Take fifteen minutes to give yourself advice on how to find more happiness in your life, starting at this point. Do the exercise in writing. As much as possible, ritualize the advice. If, for instance, your older self advises you to spend more time with your family, commit to an additional weekly or bi-weekly family outing... Return to this exercise regularly - look at what you wrote, add to it, and ask yourself whether you have taken the advice of your inner sage."
-- Tal Ben-Shahar, Happier, Fifth Meditation: Imagine.