Translating: "People with little experience have ill-formed opinions and thus when you point out the holes in their arguments they cave, whereas experienced people have well-formed opinions which makes it difficult for you when you have weak arguments by which you try to change their opinion."
I agree with you but it’s still possible to make a perfectly well formed argument and still not be correct or the best choice for the situation.
Old people cost too much and speak the truth. Two demerits.
I think that depends on the personality, not age or maturity level.