Answer:
His maturing cortex
His memories became organized differently as he grew older.
Step-by-step explanation:
The prefrontal cortex is also known as the "CEO of the brain," the part of the frontal lobes located just below the forehead. This brain area is accountable for cognitive comprehension and critical thought, and control of "appropriate" actions in social contexts. One of the last areas of the brain to achieve maturation is the prefrontal cortex. However, when asked about earlier memories, children are rarely able to remember memories of incidents that took place earlier than three or four years of age that is similar to the case of Hussein in the question.