Astructural system of inequality in which different age groups are ranked in a hierarchy based on a status value.

The answer is "age stratification".

Age stratification, the various leveled positioning of individuals into age gatherings, is one approach to exhibit social assumptions about age. At times this can transform into an out of line bias in view of age called ageism, yet for the most part age stratification is utilized by governments to help design and get ready for present and future costs. 

I'm going to go with 1,982 feet because of all of the ice.                                               ps its this is not the answer go with d 6,500.

Idisagree because it would have harmed our whole society. starting from the madness of the civilians to the mass destruction of towns.