'Eighteen' in the Bible

So the Israelis served king Eglon of Moab for eighteen years.

who trampled and troubled the Israelis during that year eighteen years for the Israelis who lived east of the Jordan River in Gilead, the land occupied by the Amorites.

He fashioned two bronze pillars, each one eighteen cubits high, with a circumference of twelve cubits.

Eighteen years after King Josiah had begun to reign, the king sent Azaliah's son Shaphan, grandson of Meshullam the scribe, to the LORD's Temple. He told him,

Jehoiachin became king at the age of eighteen years, and he reigned for three months in Jerusalem. His mother was named Hausa. She was the daughter of Elzaphan of Jerusalem.

The height of one of the pillars was eighteen cubits, and the capital on top of it was three cubits high. A latticework carved in the form of pomegranates encircled the capital, crafted completely out of brass. The second pillar was identical to the first.

Rehoboam loved Absalom's daughter Maacah more than he did all of his wives and mistresses. (He married eighteen wives and 60 concubines, fathering 28 sons and 60 daughters.)

By the grace of our God they brought back a discerning man from the descendants of Mahli, a descendant of Israel's son Levi, along with Sherebiah and eighteen of his sons and brothers;

What about those eighteen people who were killed when the tower at Siloam fell on them? Do you think they were worse offenders than all the other people living in Jerusalem?

A woman was there who had a spirit that had disabled her for eighteen years. She was hunched over and completely unable to stand up straight.

Shouldn't this woman, a descendant of Abraham whom Satan has kept bound for eighteen long years, be set free from this bondage on the Sabbath day?"