Sentence:  Twenty-one year <WSD>old</WSD> Milt Pappas and Jerry Walker , 22 , are scheduled to share the Oriole mound chores against the Bombers ' Art Ditmar in Sunday 's 2 P.M. encounter . 
Meaning of the word marked with <WSD> tags:  (used especially of persons) having lived for a relatively long time or attained a specific age