What are the causes of midlife crisis?

A Mid-life is caused by ones own thoughts. It is a combination of what a person thinks about life, about others around him, about his future and current condition and about how he is doing things at present. It is based on a persons theology. Mid life crisis occur because of a humans wish to achieve better coupled with his ability to see that he can't always achieve it.

The psychologist Carl Jung spent years researching the cause of the midlife crisis. It was known as the darkness of midlife. He noticed that the alchemists of the Middle Ages had toiled at something similar, known as the dark night of the soul. Based on his psychological studies, and his reading of ancient alchemical texts, he was able to make the connections and write about the series of events, that happen in the human mind that cause the midlife crisis.