My daughter was 7.3 years when she took CoGAT in 2nd grade. Her composites were identical but the individual percentiles were a tiny bit lower for grade versus age. Since your daughter is on the older end of the scale for grade 2 it makes sense that they would be a little lower for age (comparing her to the older kids). However, it does seem to be a pretty big difference. You should probably check with your school counselor, they may be able to provide more info than you received.