Young people often are hopelessly ideological, in the same way a dogmatic religious person would be. Both are less corruptible than your average person.
They won't do graft. They will follow orders. Even and especially when the orders are corrupt.
If you're the king of a nation, anyone trying to convince your knights to overthrow you is a corrupting force. But at the same time you could be a brutal ruler corrupted by power, and it is the knights that are trying to upturn the corrupt system.
Oh definitely. They often don't have the experience to question what they're told or see the holes and deceptions in it. For instance: they'd be more easily fooled by a fake deadline. Or in this case, they may trust and follow their leader like a little zealot, even when he's wrong and doing bad things.
I honestly believe, cheating is a primal trait. Age has little to do with it. In fact young cheats are likely to cheat with more enthusiasm and energy than elder cheats.
Safe enough to say, age has nothing to do with this.