'Old' in the Bible

Nicodemus said to Him, “How can a man be born when he is old? He cannot enter his mother’s womb a second time and be born, can he?”

As a result of this many of His disciples abandoned Him, and no longer walked with Him.

Then the Jews said to Him, “You are not even fifty years old, and You [claim to] have seen Abraham?”

I assure you and most solemnly say to you, when you were younger you dressed yourself and walked wherever you wished; but when you grow old, you will stretch out your hands and arms, and someone else will dress you, and carry you where you do not wish to go.”