But how were they chosen from the beginning if they didn't answer the call till way after the beginning.They are chosen from the beginning because the gospel of salvation is from the beginning and they answered the call of it.
It makes more sense to say they were chosen from the beginning to answer the call at God's timing.
Something like this. Before the foundation of the world, God chose Joe Blow to be born in Kansan City in 1983, and then when Joe Blow is 50 years old, he will hear the gospel and the Holy Spirit will open his heart to respond to that gospel message and then he is saved and will endure to the end.
Joe Blows brother who was born 5 years earlier, God simply passed over and left him to his own devices. He lived a pretty good life, never got into trouble, but would never accept the gospel when he heard it.
He that believes the gospel (Joe Blow) is not condemned: but he that does not believe (Joe Blow's brother) is condemned, because he has rejected the gospel.