'16 people in '16, e.g.

• Promgoers, e.g.: Abbr.
• RRSP owners. likely
• Certain prom-goers: Abbr.
• Many AARP mems
• Official name for a 7-Down: Abbr.
• Graduating class members, briefly
• End-of-school-year pranksters (Abbr.)
• New alums, last yr
• HS yearbook section

Wiktionary Word definitions in Wiktionary
abbr. (context texting chatting English) (abbreviation of serious English)