Demography leads to more conservative European societies.

Using the Survey of Health, Ageing and Retirement in Europe (a total of 66,188 participants from 15 European countries) and the European Gender and Generation Survey (a total of 121,248 participants from 12 countries), we investigated i) whether differences in political attitudes and attitudes toward family values (i.e. attitudes toward homosexual couples, attitudes toward female reproduction) are associated with differences in the average number of children, and ii) whether such an association between fertility and attitudes affects the population share of these attitudes in subsequent generations. We found that in most of the countries analyzed, right-wing (conservative) individuals have, on average, more children and grandchildren than left-wing (liberal) individuals. We also found that the proportion of right-wing individuals increases from generation to generation. Since political attitudes are presumably evolved traits that are socially and genetically transmitted from one generation to the next, these findings may suggest that demographic differences can lead to shifts in prevailing political attitudes. Thus, to some extent, demography may explain longer-term political trends.