Sentence:  Kerr , who set the world record earlier this month in New York with a clocking of 1.09.3 , wiped out Mills 's early pace and beat the <WSD>young</WSD> Big 10 quarter-mile king by 5 yards . 
Meaning of the word marked with <WSD> tags:  (used of living things especially persons) in an early period of life or development or growth