Sentence:  It is significant that the Catskills , which used to be the summer playground for <WSD>older</WSD> teen-agers , a kind of summer suburb of New York , no longer attracts them in great numbers - except for those who work there as waiters , bus boys , or counselors in the day camps . 
Meaning of the word marked with <WSD> tags:  (used especially of persons) having lived for a relatively long time or attained a specific age