There is such a thing as losing a ten year chunk of your of life. This is more common than people realize. It can manifest in a number of ways.
You may marry poorly or take the wrong job. You can get drunk for ten years or just go through a time that is so out of character for you it can be seen as something akin to temporary insanity.
As for the astrology, people with stelliums or a good number of their planets in aspect are probably more likely to have a period like this in their life. Basically an outer planet transit comes along and whoops! The person joins a cult!
The majority of people I know have had a period like this (myself included). For the people who would say no time is ever wasted, I can see that perspective, but it is not helpful in the near term for those who wake up one day with awareness they’re on top the wrong mountain or have driven themselves right into a wall.
Have you ever lost 10 years of your life? Tell us!
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