How old was Solomon's father when he conquered Jerusalem?
Joshua was likely in his 80s when he warred against the enemy host at the waters of Merom. Ane he utterly destroyed the city of Hazor afterward, killing all men, women, and children as the Lord had commanded him.
Joshua 11:20
For it was of the Lord to harden their hearts, that they should come against Israel in battle, that he might destroy them utterly, and that they might have no favour, but that he might destroy them, as the Lord commanded Moses.