"elderly" in the noun sense
1. aged, elderly
people who are old collectively
"special arrangements were available for the aged"
"elderly" in the adjective sense
1. aged, elderly, older, senior
advanced in years (`aged' is pronounced as two syllables
"aged members of the society"
"elderly residents could remember the construction of the first skyscraper"
"senior citizen"
Source: WordNet® (An amazing lexical database of English)
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