Define "Midlife Crisis"

According to Wikipedia:

"MIDLIFE crisis is a term coined in 1965 by Elliott Jaques [(January 18, 1917-March 8, 2003) a Canadian psychoanalyst and organizational psychologist. FYI, he developed the notion of requisite organization.] and used in Western societies to describe a period of dramatic self-doubt that is felt by some individuals in the “middle years” or middle age of life, as a result of sensing the passing of their own youth and the imminence of their old age. Sometimes a crisis can be triggered by transitions experienced in these years, such as extramarital affairs, andropause [male menopause] or menopause, the death of parents or other causes of grief, unemployment or underemployment, realizing that a job or career is hated but not knowing how else to earn an equivalent living, or children leaving home. The result may be a desire to make significant changes in core aspects of day-to-day life or situation, such as career, work-life balance, marriage, romantic relationships, big-ticket expenditures, or physical appearance.” http://en.wikipedia.org/wiki/Midlife_crisis
[parentheses mine]

Again, someone writes it better than I would...gotta love plagiarism.