Depersonalization disorder is most common among those who are:
a. adults over 60.
b. adults between the ages of 40 and 60.
c. adolescents and young adults.
d. preadolescents.

B. Adults between the ages of 40 and 60.  
The disease is quite rare when you look at it in children and adults it does happen but it is more common in adults who are ranging from 40-60 this is because the brain has aged a lot throughout the time the person has been living.

It would be around the egyptian area.

Accumulating more land so that your country can continue expanding without running into problems such as overpopulation