2 Chronicles 27:1

Jotham [was] twenty and five years old when he began to reign, and he reigned sixteen years in Jerusalem. His mother's name also [was] Jerushah, the daughter of Zadok.

Ver. 1. Jotham was twenty and five years old.] Twenty and five he was years old when his father was stricken with leprosy; from which time he reigned as king, even in his father's days: after whose death the kingdom was more solemnly stablished to him alone. Hence he is said then to have begun his reign; and then was Ahaz twenty years old, Jotham being about forty.