The name ‘Juventutem’ itself is the Latin word for 'youth' and it appears in the opening lines of the prayers at the foot of the altar in the traditional Latin Mass.
Introíbo ad altáre Dei. / Ad Deum, qui lætíficat juventútem meam.
I will go in to the altar of God. / To God, who giveth joy to my youth (Psalm 42:4).