Historical clue formulations

• One studying for a bar or bat mitzvah, usually — 2022-12-25
• Many a middle schooler — 2019-10-06
• Like the phase ending after 12 — 2019-03-17
• Admire oneself a little too much — 2016-07-24
• In the sixth grade or earlier, typically — 2013-01-28
• What a bar mitzvah recently was — 2011-09-24
• Many a Little Leaguer — 2010-09-19
• Sixth-grader, usually — 2005-12-04
• Middle school entrant, e.g. — 2003-09-14
• 12-year-old — 1995-10-07