Is three weeks too young to sex a chick?

What breed is Aaron? You say Black Star, but you hatched him? If he actually is a Black Star, those are sex-linked hybrids, and Aaron is definitely a pullet.
 
You can only sex chicks at about six weeks old. Sometimes you can sex them earlier than that, but they have to be a fast-growing breed. Checking their wings will not work unless it is a breed and a bloodline bred specifically for that, which you likely will never find.
 

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