See also Tragedy of the Commons, Common Property Resource (CPR), Theory of the Firm[?], Theory of the State[?]
... 8.0% from 18 to 24, 31.0% from 25 to 44, 21.9% from 45 to 64, and 16.9% who are 65 years of age or older. The median age is 39 years. For every 100 females there are 113.3 ...