'Old' in the Bible

Nicodemus asked him, "How can a person be born when he is old? He can't go back into his mother's womb a second time and be born, can he?"

Then the Jewish leaders asked him, "You are not even 50 years old, yet you have seen Abraham?"

Jesus told him, "Feed my sheep. "Truly, I tell you emphatically, when you were young, you would fasten your belt and go wherever you liked. But when you get old, you will stretch out your hands, and someone else will fasten your belt and take you where you don't want to go."