I asked this question of my dear friend, and neighbor who is 102.
Her philosophy is that no matter how something turns out, or why something happens, it's always for the best. "You don't always know it at the time, but it always comes out right in the end". She is such a positive person, and I think this has contributed to her longevity. I wrote a hub about an interview I had with her. She is quite a fascinating person.