So all the service of Yahweh was prepared the same day, to keep the Passover, and to offer burnt offerings on Yahweh’s altar, according to the commandment of King Josiah. 17 The children of Israel who were present kept the Passover at that time, and the feast of unleavened bread seven days. 18 There was no Passover like that kept in Israel from the days of Samuel the prophet, nor did any of the kings of Israel keep such a Passover as Josiah kept with the priests, the Levites, and all Judah and Israel who were present, and the inhabitants of Jerusalem.
2 Chronicles 35:16-18 (WEB)
This biblical example is referring to the Passover that occurred in King Josiah's eighteenth year as king of Israel. King Josiah became king of Israel at eight years old; after the assassination of his father King Amos, a man who did evil in the eyes of YHWH.