'Thirty' in the Bible

Adam had been living for a hundred and thirty years when he had a son like himself, after his image, and gave him the name of Seth:

And all the years of Adam's life were nine hundred and thirty: and he came to his end.

And after the birth of Jared, Mahalalel went on living for eight hundred and thirty years, and had sons and daughters:

And this is the way you are to make it: it is to be three hundred cubits long, fifty cubits wide, and thirty cubits high.

And Arpachshad was thirty-five years old when he became the father of Shelah:

And Shelah was thirty years old when he became the father of Eber:

And Eber was thirty-four years old when he became the father of Peleg:

And after the birth of Peleg, Eber went on living for four hundred and thirty years, and had sons and daughters:

And Peleg was thirty years old when he became the father of Reu:

And Reu was thirty-two years old when he became the father of Serug:

And Serug was thirty years old when he became the father of Nahor:

And he said, Let not the Lord be angry with me if I say, What if there are thirty there? And he said, I will not do it if there are thirty.

And the years of Ishmael's life were a hundred and thirty-seven: and he came to his end, and was put to rest with his people.

Thirty camels with their young ones, forty cows, ten oxen, twenty asses, and ten young asses.

Now Joseph was thirty years old when he came before Pharaoh, king of Egypt. And Joseph went out from before the face of Pharaoh and went through all the land of Egypt.

All these, together with his daughter Dinah, were the children of Leah, whom Jacob had by her in Paddan-aram; they were thirty-three in number.

And Jacob said, The years of my wanderings have been a hundred and thirty; small in number and full of sorrow have been the years of my life, and less than the years of the wanderings of my fathers.