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Those findings apply to a single generation, yet they tug at the edges of evolutionary theory, in which species change slowly over millennia, not rapidly over the months or years of a single life. Charles Darwin’s process of natural selection holds that nature choses the best-adapted organisms to reproduce and survive in any given ecosystem. The process operates when DNA sequences mutate randomly, and organisms with the specific sequences best-adapted to the environment multiply and prevail – causing gene expression to shift. Yet as surely as the slow march of Darwinian evolution shapes life on Earth over aeons, scientists have found that epigenetic signals can work each day, and not just through methyl groups. Experience in the environment could also alter chromatin, the molecular matrix making up our chromosomes; RNA, the messenger molecules that translate genetic instructions from DNA into protein; and histones, the proteins involved in packaging and structuring the chromatin comprising the genes.

What these individuals are not doing is clear enough, says Erik Hurst, an economist at the University of Chicago, who has been studying the phenomenon. They are not leaving home; in 2015 more than 50% lived with a parent or close relative. Neither are they getting married. What they are doing, Hurst reckons, is playing video games. As the hours young men spent in work dropped in the 2000s, hours spent in leisure activities rose nearly one-for-one. Of the rise in leisure time, 75% was accounted for by video games. It looks as though some small but meaningful share of the young-adult population is delaying employment or cutting back hours in order to spend more time with their video game of choice.

People work for many reasons – to occupy their time, to find purpose in life and to contribute to society, among other things – but the need to earn money typically comes top of the list. Money puts food on the table, clothes in the wardrobe and a roof overhead. Yet these days, satisfying those needs in the most basic way does not take an especially large income, particularly for those with the option of depending on family members for assistance. The reason to work harder and earn more than the minimum needed to survive is, in part, the desire to have something more than the bare necessities – nice meals, rather than the cheapest calories available, a car, holidays abroad, a home full of books and art. Much of the work we do is intended to earn the money to afford a few luxuries to add to our comfort and enrich our lives.Yet we face a trade-off. The harder we work, the less time we have to enjoy the luxuries our labour affords us. The more lavish the luxuries we seek, the more we must earn to acquire them, and the longer and harder we find ourselves working.

Stand back, however, and the implications are far more substantial than this. One can just about spot the vision of a distant, near-workless future in the habits of young gamers. If good things in life can be had for very little money, then working hard to have more than very little money looks less attractive. The history of the industrial era has been one in which technology has reduced the proportion of income devoted to necessities like food while providing vast new possibilities for consumption. As this happened, the hours worked by the typical person declined.