I´ll answer the birth date but otherwise I think Erich is the one to answer this...and I don´t know whether he was the youngest colonel,anyway..

Helmut Lent was born on June 13th, 1918 in Pyrehne, Germany which I believe is now part of Poland...

http://www.luftwaffe-experten.com/pi...ht/H_Lent.html

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