Many of us get to our 40's and re-evaluate our lives. The picture of how we saw ourselves as a young person when the slate was clean and the future was fresh and open is not exactly how it turns out. While not always a bad thing, some of us have this nagging feeling of missed opportunities or adventure-not-taken about our lives. That, coupled with pain in our knees, aversion to late-night events and frequent heartburn puts many of us in the spiral of depression, marked primarily with the thought that it's-too-late-for-us to do anything crazy, big, adventurous, etc.
The John D. and Catherine T. MacArthur Foundation Research Network have been studying this phenomenon since 1994. Their findings, interpreted by Lifetwo.com, say that the data suggests that only 5-12% of middle-aged people actually experience a midlife crisis. I would hazard a guess that this number is low, but hate that I'm in that group. I'm going to do something about it!