Definition of subteenage in English:

subteenage

adjective

US
  • Of a child: under (especially just under) thirteen years old; not yet teenage, subteen.

Origin

1930s; earliest use found in Abilene (Texas) Reporter-News. From sub- + teenage.

Pronunciation

subteenage

/ˌsʌbˈtiːneɪdʒ/