Why is Sebastian Vettel retiring from F1?

Four-time Formula 1 world champion..

..Sebastian Vettel has announced that he will retire from the sport in 2022.

The German driver, who won the Drivers' Championship with Red Bull...

...in 2010, 2011, 2012 and 2013, made the announcement using the first post on his new official Instagram page...

...leaving fans and the media alike. surprised. 

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