Maybe we can find the answer from the Word by making use of this analogy. We are to understand that this everlasting life begins upon believing. Here is a double living. A begetting, or start of life, and this unto a living hope. In this case it is the hope of Israel.
Life begins at the begetting.
Note that this seed, the Word of God is said to be incorruptible. It is living and lasts forever. Note the emphasis on the fact that the seed, the Word, is incorruptible, hence there can be no hindrance of any kind to prevent the birth that is sure to follow. All people who are Spirit born have a new life, a new nature, the new man, the Spirit of Christ, the Spirit of God, and other names used in the Scriptures for such a condition. Life begins with the begetting, with conception in the physical realm.