Sentence:  This definition of success is located in society's structures and suits society, not the <WSD>agers</WSD>. Successful ageing is arguably therefore a socially constructed phenomenon, characterized by lack of “noise,” maintenance of youthful status until death, and a dogged engagement with social structures which appear almost as if designed to discourage the engagement of older people. 
Meaning of the word marked with <WSD> tags:  One who is aging; an elderly person.