Information on the ages used historically in western age of consent laws is not readily available. This table has been compiled from a combination of historical and contemporary sources. By 1880, the first date chosen, many western nations had established an age of consent for the first time, typically of 12 or 13 years. By 1920, when the influence of reform campaigns that established a new link between the age of consent and prostitution had run its course, most had revised their age upward, to 14 or 15 in European nations, and 16 in the Anglo-American world. In the last decades of the 20th century, states and nations with ages below those averages amended their laws to move closer to them. In Europe that growing conformity owed much to moves toward greater European integration. Given that the rationale for the age of consent has remained essentially unchanged in its emphasis on the need to protect 'immature' children, the table highlights the shifting and various definitions of childhood employed across time and cultures.