Western European marriage pattern
The Western European marriage pattern is a family and demographic pattern that is marked by comparatively late marriage (in the middle twenties), especially for women, with a generally small age difference between the spouses, a significant proportion (up to a third) of people who remain unmarried, and the establishment of a neolocal household after the couple has married. In 1965, John Hajnal posited that Europe could be divided into two areas characterised by different patterns of nuptiality.
Source: Wikipedia — Western European marriage pattern (CC BY-SA 4.0)