“I assure you: When you were young, you would tie your belt and walk wherever you wanted. But when you grow old, you will stretch out your hands and someone else will tie you and carry you where you don’t want to go.”

Now Jesus said this to indicate the kind of death Peter would experience in honoring God. [Note: Some see the "stretching out your hands," verse 18, as a reference to crucifixion]. And after saying this, Jesus said to him, "Be my follower."