There were a few black knights in history. However the character of a black knight is a stock character that usually is in the story to fight against the white knight.
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If your actual question is ,"How old do you have to be in order to be a knight?", then I have an answer for you. I guess if you are imaginative, you could be a knight fighting an evil dragon in your mind, and you could do that at any age! But if you want the logical answer, you had to be a strong, tall man, which probably means he has to be young as well. So they would have to be at least in there 20's.
He was never really evil, he was working undercover for Konoha spying on the evil organisation Akatsuki.
No Cleopatra was not an evil pharaoh.
He was a squire to a knight and saw the sword to give it to the knight to protect himself.
A teenager who customarily served as a knight's attendant during Medieval times was called a squire.