What are some of the indicators that someone might be going through a midlife crisis?

Distinguish between a “midlife crisis” and “midlife transition”.
In your own wording, how would you define a “midlife crisis” (no book/site definitions)? In your opinion:
For what reasons might a crisis occur, and
What resolves the crisis (i.e., how does it get fixed)?
What are some of the indicators that someone might be going through a midlife crisis? Please note if you believe that the indicator is more common in one of the sexes.

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