Let's say that one day I can no longer dance Argentine tango. I feel strongly that the skills I have learned from social tango would increase the likelihood that I will live longer, and if not longer, then at least happy years. Longevity is not my goal. Increasing my "life expectancy" also is not a my goal. But, yes,
Expectancy in Life, is my past and present which has a good chance of being my happy future.
