Wiktionary
seventysomething
alt. (context countable colloquial English) A person aged between 70 and 79 years. n. (context countable colloquial English) A person aged between 70 and 79 years. num. Between seventy and eighty.
Usage examples of "seventysomething".
Janet was wearing black wraparound sunglasses of the style favored by rock stars and seventysomething Hollywood agents, and young, Gappy clothing.