Sentence:  He was seeing , somehow , the face of a <WSD>young</WSD> boy , the boy Simms Purdew must once have been , a boy with sorrel hair , and blue eyes dancing with gaiety , and the boy mouth grinning trustfully among the freckles . 
Meaning of the word marked with <WSD> tags:  (used of living things especially persons) in an early period of life or development or growth