difference or same behavior of young and old Amir

I think there are big different between child Amir and thirty eight years old Amir. First of all, Amir accepted Hassan to be a real brother. Before having a conversation with Rahim Khan, Amir was actually confused relationship with Hassan whether friend or brother; however, finally, Amir turned to make in mind right way. And also, Amir left money for other people was differences between young and old. However, he stood had a behavior like in childhood. When he heard that Hassan’s was left in somewhere behind Rahim Khan and his parents, Amir did not want to go back to bring poor Hassan’s son.