age norm

意味	発達の平均年齢基準 The average age at which a particular skill or behavior is expected to appear.

WordNetage normと他の単語との繋がり

意味	the average age at which particular performances are expected to appear 特定の行動や成績が現れると期待される平均年齢
上位語	average平均 norm標準、普通のこと