'Older' in the Bible

The residents of Jerusalem made Jehoram's son Ahaziah king in his place after the raiding party that had invaded the city with the Arabs had killed all of the older sons. That's how Jehoram's son Ahaziah became king of Judah.

Amaziah gathered Judah together and organized them according to their ancestral households under commanders of thousands and hundreds throughout Judah and Benjamin. He then mustered an army from those who were 20 years old and older. He discovered that there were 300,000 elite soldiers qualified for war duty and capable of handling spears and shields.

without regard to genealogical enrollment, to every male 30 years old and older that is, to everyone who entered the LORD's Temple as their duty obligations required for their work and duties according to their divisions