Mutual Aid: A Factor in Evolution (1902) was written by Peter Kropotkin while in exile in England. Partly as a response to Social Darwinism, Kropotkin drew on his experiences in scientific expeditions during his time in Siberia to illustrate the phenomenon of cooperation among both animal species and human communities.
... the age of 18, 5.0% from 18 to 24, 26.8% from 25 to 44, 27.7% from 45 to 64, and 19.9% who are 65 years of age or older. The median age is 43 years. For every 100 ...