'Old' in the Bible

Nicodemus said to him, "How can a man be born when he is old? Can he enter a second time into his mother's womb, and be born?"

The Jews therefore said to him, "You are not yet fifty years old, and have you seen Abraham?"

Most certainly I tell you, when you were young, you dressed yourself, and walked where you wanted to. But when you are old, you will stretch out your hands, and another will dress you, and carry you where you don't want to go."