Isaiah 40:30
"Even the youths shall faint and be weary, and the young men shall utterly fall:"
Cross References (ranked by relevance)
Therefore the flight shall perish from the swift, and the strong shall not strengthen his force, neither shall the mighty deliver himself:
The young lions do lack, and suffer hunger: but they that seek the LORD shall not want any good thing.
There is no king saved by the multitude of an host: a mighty man is not delivered by much strength.
I returned, and saw under the sun, that the race is not to the swift, nor the battle to the strong, neither yet bread to the wise, nor yet riches to men of understanding, nor yet favour to men of skill; but time and chance happeneth to them all.
Their bows also shall dash the young men to pieces; and they shall have no pity on the fruit of the womb; their eye shall not spare children.
Therefore the LORD shall have no joy in their young men, neither shall have mercy on their fatherless and widows: for every one is an hypocrite and an evildoer, and every mouth speaketh folly. For all this his anger is not turned away, but his hand is stretched out still.