Partly, this is because they have to. The cost of a house and the paucity of jobs means it’s harder to get settled quickly. In the post-war years, young adults were much quicker to go into a career in which they stayed, won financial independence from their parents and settled down to a family. In 1981, British women got married, on average, at 23.1 years old. In 1991 that figure rose to 25.5. In 2009, it crossed 30 for the first time. In the same period, the average age of marriage for men rose from 25.4 to 32.1: a huge, sudden leap.