What do we learn from "Iy Lach Eretz she'Malkech Na'ar [v'Sarayich ba'Boker Yochelu]"?
Rashi: Woe to a land whose king and judges act like youths. Metzudas David - he does not put to his heart to fix the country.
Ibn Ezra: After giving the Kesil's words, it teaches that if he would be king, it would be bad [for the nation], and all the more so if he is also a youth. "Iy" is like "Oy", and also above ("v'Iy Lo 1 ha'Echad Yipol" - 4:10). There is not a third verse like this.
Rashbam: Woe to a land whose king is a Kesil; he destroys the world with his folly and youth. Therefore we must distance from a young king!
Ri Kara: When the king is a youth, he eats in the morning, like youths; when he eats, his officers eat with him [Metzudas David - when they rise in the morning 2 ]. They eat, are satiated and get drunk; they cannot engage in needs of the kingdom and judging the nation.
Rid: The king acts like a youth and damages his kingdom.
Seforno: Just like conduct of Kesilim ruins private matters, folly of the king ruins the entire country.
What do we learn from "[she'Malkech Na'ar] v'Sarayich ba'Boker Yochelu"?
Ibn Ezra, Rid: [The officers] engage only in eating - the opposite of "Dino la'Boker Mishpat" (Yirmeyah 21:12).
Rashbam: The officers are next to the king. They eat in the morning, and do not do anything [purposeful]; this destroys the world.
Seforno: When the king and his officers are youths, they eat in the morning, like youths. The do not have completion of Chachmah, nor experience. They need counsel of others - even so, they turn to their pleasures and desires. They do not turn to guard the country from ruin and its causes.