2 Chr 33:1

בֶּן־שְׁתֵּ֥ים עֶשְׂרֵ֛ה שָׁנָ֖ה מְנַשֶּׁ֣ה בְמָלְכ֑וֹ וַחֲמִשִּׁ֤ים וְחָמֵשׁ֙ שָׁנָ֔ה מָלַ֖ךְ בִּירוּשָׁלִָֽם׃

Manasseh was twelve years old when he became king, and he reigned in Jerusalem fifty-five years.