Wiktionary
twentyish
a. (context informal English) Of about twenty years of age.
Usage examples of "twentyish".
The neighbors walked their dogs on Parmenter Road, kids rode their bikes, and in the summer a battered ice-cream truck went by, driven by a twentyish girl whose smile was far more interesting to the neighborhood boys than ice cream.
He was a twentyish man with long hair, a Fu Manchu mustache, and a beard.