Historical clue formulations

• One between 10 and 20, say — 2022-02-02
• Not mature — 2019-11-01
• Teen, e.g. — 2018-05-02
• Preadult — 2003-09-29
• Stripling — 2000-05-21
• Minor — 1998-11-27
• Y*H — 1996-05-19