An age or eon is a definite period of time. The present eon began at the flood and will last to the coming of Christ. The next eon will last for a thousand years. They were not eternal in the past. They will not be everlasting in the future.
Eternal torment is limited to the age-times or eonian times.
It magnifies the cross of Christ. It glorifies God. Sin, judgment, and death are temporary, confined to the times of the eons. God will become All in all.