Romans 9
22 What if God, wanting to show His wrath and to make His power known, endured with much longsuffering the vessels of wrath prepared for destruction, 23 and that He might make known the riches of His glory on the vessels of mercy, which He had prepared beforehand for glory,
Nobody born onto this earth knows/knew which category they fall into in Romans 9 above. And how can they. This is entirely within the purview of God. As far as the Gospel is concerned, we preach the gospel to every living creature. Shout it from the rooftops.
Many have come to saving faith who were quite literally dead in their sins. Looking at the lives they came from, mass-murderers, rapists, fraudsters, thieves ----- the gospel of Grace has changes hundreds of thousands, perhaps millions of these people due to God's grace. They are unrecognisable (what they were to what they have become). We don't fully know who is elect and who not. All we do is preach Christ and Him Crucified. The Elect will always respond (whether now or later). Some who are NOT elect will also respond, but they will not go onto completion but fall back. It doesn't mean that they NEVER believed. It means that they eventually stopped believing.