Technically, that is not correct.
The Old Testament (the part of the Bible written before Jesus’ birth) was completed in 450 B.C., hundreds of years before Jesus was born. A large number of prophecies were made in astonishing detail by many people throughout these books. In fact, fulfilled prophecy is one of the distinguishing marks of the Bible, authenticating its claim to be the inspired Word of God.
Great point. Christ has existed from the beginning, from before Creation. All things exist through Him. He was at the beginning.