raising children. In other words, investing more in fewer children became more economically sensible, as economist Gary Becker argued. (This is the first demographic transition.) By the 1960s, people began moving from traditional and communal values towards more expressive and individualistic outlooks due to access to and aspiration of higher education, and to the spread of lifestyle values once practiced only by a tiny minority of cultural elites. (This is the second demographic transition.) At the start of the 21st century, Europe has an aging population. This problem is especially acute in Eastern Europe, whereas in Western Europe, it is alleviated by international immigration. Researches by demographers and political scientists Eric Kaufmann, Roger Eatwell, and Matthew Goodwin suggest that such immigration-induced ethnodemographic change is one of the key reasons behind public backlash in the form of national populism across the rich liberal democracies, an example of which is the 2016 United Kingdom European Union membership referendum (Brexit). In 2018, 19.70% of the population of the European Union (EU) were 65 or older. The median age was 43 in 2019, and was about 29 in the 1950s. Europe had significant population growth in the late 20th century. However, Europe's growth is projected to halt by the early 2020s due to falling fertility rates and an aging population. In 2015, a woman living in the EU had on average 1.5 children, down from 2.6 in 1960. Although the EU continues to experience a net influx of immigrants, this is not enough to balance out the low fertility rates. In 2017, the median age was 53.1 years in Monaco, 45 in Germany and Italy, and 43 in Greece, Bulgaria, and Portugal, making them some of the oldest countries in the world besides Japan and Bermuda. They are followed by Austria, Croatia, Latvia, Lithuania, Slovenia, and Spain, whose median age was 43. North America By the mid-2010s, sub-replacement fertility and growing life expectancy meant that Canada had an aging population. Statistics Canada reported in 2015 that for the first time in Canadian history, more people were aged 65 and over than people below the age of 15. One in six Canadians was above the age of 65 in July 2015. Projections by Statistics Canada suggest this gap will only increase in the next 40 years. Economist and demographer David Foot from the University of Toronto told CBC that policymakers have ignored this trend for