Sharing about English Lesson

This appeared in the online version of the Straits Times (ST Interactive, 17 January 2012). 

Elderly in this context is a noun, and like all other nouns derived from adjectives or adjective phrases and used to refer collectively to a group, it is considered plural.  Hence, prescriptively, singular enjoys is wrong and plural enjoy is preferred.  Similar nouns include (the) dispossessed, less fortunate, sick, meek and brave.