Aging is depressing (until 50)??

I read an article recently in the Globe and Mail that discussed a new research study about being happy in mid-life. It said that aroudn the world,

most of us bottom out in our mid-40s, describing ourselves as unhappy or even depressed.

But here's the good news: We bounce back and describe ourselves as happier in our 50s and 60s.

Does this explain my mid-life crisis? If it does, at least there's a bright side in the next decade...