'Thirty' in the Bible
And when Adam had lived one hundred and thirty years, he fathered a child in his likeness, according to his image. And he called his name Seth.
And all the days of Adam which he lived were nine hundred and thirty years, and he died.
And after Mahalalel had fathered Jared, he lived eight hundred and thirty years, and fathered sons and daughters.
And this [is] how you must make it: the length of the ark, three hundred cubits; its width fifty cubits; its height, thirty cubits.
When Shelah had lived thirty years, he fathered Eber.
And Eber lived four hundred and thirty years after he fathered Peleg, and he fathered [other] sons and daughters.
When Serug had lived thirty years, he fathered Nahor.
And he said, "Please, let not my Lord be angry, and I will speak. What if thirty be found there?" And he answered, "I will not do [it] if I find thirty there."
thirty milk camels with their young, forty cows, ten bulls, twenty female donkeys, and ten male donkeys.
Now Joseph {was thirty years old} when he stood before Pharaoh, the king of Egypt. And Joseph went out from the presence of Pharaoh and traveled through the whole land of Egypt.
And Jacob said to Pharaoh, "The days of the years of my sojourning [are] one hundred and thirty years. Few and hard have been the days of the years of my life, and they have not reached the days of the years of the lives of my ancestors in the days of their sojourning."