Well the USCF knows your exact USCF rating and your birth date, so it is very easy for them to make these lists. Though they should be taken with a grain of sa

Well the USCF knows your exact USCF rating and your birth date, so it is very easy for them to make these lists. Though they should be taken with a grain of salt because, especially for young players who are improving quickly, their rating is very likely a lagging indicator of their current skill.