One must come to Jesus in repentance and faith. Christian universalism agrees with that. Where you and I disagree is whether or not man has only a few short hours or at most a few short years to do so before being separated from God forever and ever and ever and ever... , or can he do so in the next age.
NEXT AGE?
Do you mean that time commencing with our physical death, and for believers, ending at our resurrection to reign with Jesus during His millenial reign on the earth. But there will be none who died as unbelievers that are resurrected for this age.
During the Millenial reign of Jesus the Christ? Remember, scripture says that unbelievers who died from the natural life will not be resurrected for the millenial reign of Jesus.
How about after the Millenial reign of Jesus but before Judgement, just before ALL UNBELIEVERS are cast into the lake of fire?
Is there some other age that you have in mind? Maybe something like a return from the lake of fire for a second chance? Of course that would include Satan, the False Prophet, Satan's demons, sin, and evil too! ALL of those cast into the lake of fire would get a second chance wouldn't they?
If you find that in the Holy Scriptures, please post the reference so that we can all learn from it.
Don't forget that Jesus preached in hell to those who had not heard the Gospel message, so that they, too, could be saved by faith under God's grace. There will never be another Crucifixion of Christ, another Atonement, or another burial or another preaching in hell, by the Christ. So don't count on that scenario!
Awaiting your reply as to what NEXT AGE you are referring to!