Middle Childhood (7-11 yrs)-Cognitive / Socio-emotional: Between the ages of 5 and 8, children will tell more lies to test what they can get away with, especially lies related to school and friends. Maintaining the lies may still be difficult. Ages 9 to 12 most children this age are well on their way to establishing a hardworking, trustworthy, and conscientious identity. But they are getting better at maintaining lies, but they may feel guilty after lying.