In western societies, one is considered middle-aged and about to experience a "mid-life crisis" at age
a. 30
b. 35
c. 40
d. 50

50

Explanation:

Recent researches claim that the mid-life crisis may occur from the ages of 45–64. They last about 3–10 years in men and 2–5 years in women.

It was invented in London in 1957 by a 40-year-old Canadian named Elliott Jaques. He claimed that people in their mid-30s typically experience a depressive period. He announced that in this period people realize that their lives are halfway over and that death is closer: Death will happen to them, too. However, through times life spans in rich countries were increasing by about 2.3 years per decade. And nowadays the mid-life crisis age also has increased.

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explanation:

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