Under normal circumstances the Proverb is true. That being so, the day of Jehovah will bring about critical times hard to deal with and will exceed the limits of normal human strength. It has to be that way. God has to get everyone's attention. Nuclear war ought to do the trick. It certainly appears as if the Anglo beast is pushing for it.The glory of young men is their strength.—Prov. 20:29.
As we grow older, we may be afraid that we are not going to be as useful to Jehovah as we once were. While it may be true that we have less energy than before, we can use the wisdom and experience we have acquired to help younger ones reach their full potential and take on new responsibilities. Older ones must be humble if they want to help younger ones. A humble person views others as being superior to him. (Phil. 2:3, 4) Older ones who show this quality realize that in many cases there is more than one Scriptural and effective way to carry out an assignment. Thus, they have a realistic view of the way they did things in the past. (Eccl. 7:10) While they have much valuable experience to share with the younger generation, they realize that “the scene of this world is changing” and that it may be necessary for them to adapt to new circumstances.—1 Cor. 7:31. w21.09 8 ¶1, 3
I have mentioned this before, so excuse the repetition, and I am speculating here, but I am allowed to do that. Jesus said the tribulation will be of such severity that God will cut it short or else no flesh will be saved. We are talking about divine intervention. Will it be evident? I believe so. And that will be the basis for the judgment. What if the demons goad the rulers to unleash their whole arsenal of nuclear missiles? The Devil has made it horrifyingly simple. With push-button ease, one person can destroy the entire planet. But what if God's angels defused most of the missiles in flight? It would be known by all. And that is how the God of salvation will make himself known. Consider the ten plagues. Jehovah intervened to protect the Israelites. For example, when darkness came over Egypt for three days the sun shone upon the land of Goshen where the Hebrews lived.
Speaking of young men and their glorious strength, here is what Jehovah has to say during the dark days to come when Jesus reveals himself to certain chosen, individuals: "Do you not know? Have you not heard? Jehovah, the Creator of the ends of the earth, is a God for all eternity. He never tires out or grows weary. His understanding is unsearchable. He gives power to the tired one and full might to those lacking strength. Boys will tire out and grow weary, and young men will stumble and fall, but those hoping in Jehovah will regain power. They will soar on wings like eagles. They will run and not grow weary; they will walk and not tire out.” - Isaiah:40: 28-31