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King David died of old age according to the Bible.
Joash was the youngest king at the age of seven.
David in the Bible died of old age after ruling as king for many years.
Two of them were Joash and Josiah. Josiah became king at age 8 and was known as a king who loved God.
Josiah became a king at the age of 8, and would have been king at 10 as well. He is one of the few recorded child kings.
The bible does not give his age, but he was the sun of Kish, and it was the prophet Samuel who anointed him as the king of Isa real. Samuel also anointed David as the king of Israel.
Ruth must have died of old age, as she was the great grand mother of king David.
She was the mother of King Solomon. She was also instrumental in preventing a revolt in King David's old age (1 Kings ch.1).
King David was the youngest of Jesse's 8 sons. Jesse lived in Bethlehem and was the grandson of Ruth and Boaz.
King Joash became king at the age of seven. I don't know that he was guided by a wise uncle but he did do things according to God's law and was considered a righteous ruler. (2 Kings 12)
An age for him was never really declared.
With 55 years in office (starting at age 12), Manasseh had the longest reign of any monarch mentioned in the bible. (2 Kings 21:1)