The List of Conservation topics is a link page for the conservation of both the natural environment and the built environment. There are four sections so far:
... the population is spread out with 18.5% under the age of 18, 4.4% from 18 to 24, 20.6% from 25 to 44, 26.3% from 45 to 64, and 30.2% who are 65 years of age or older. Th ...