If they die young, they will have no hope and no consolation in the day of decision: The day of decision refers to the final judgment, that is, “Judgment Day” (Good News Translation). See verse 13, where a different expression is used in Greek, but where the meaning is the same. Good News Translation offers a good model. Contemporary English Version is also good:

• And if they die in their youth,
they will be without hope
on the day of judgment.

Quoted with permission from Bullard, Roger A. and Hatton, Howard A. A Handbook on The Wisdom of Solomon. (UBS Helps for Translators). New York: UBS, 2004. For this and other handbooks for translators see here.