'Old' in the Bible

He considered his own body to be already dead (since he was about 100 years old) and also considered the deadness of Sarah’s womb, without weakening in the faith.

For we know that our old self was crucified with Him in order that sin’s dominion over the body may be abolished, so that we may no longer be enslaved to sin,

But now we have been released from the law, since we have died to what held us, so that we may serve in the new way of the Spirit and not in the old letter of the law.