Alessandro Rosina's new book The Disappearance of Young People has been in bookstores since November. The demographer explains how, after the effervescent growth of the first decades after the Second World War, we have entered a regressive spiral, and foreshadows the inevitable and very concrete repercussions that will affect many aspects of our lives. For example, pensions, since an increasingly small number of active citizens will have to support a growing number of elderly people with their work; health, because the unfavorable relationship between young and old will result in a shortage of health personnel, in the face of a population increasingly in need of care; immigration, which will be confirmed as a key element in tomorrow's society, and perhaps one of the few real hopes of restoring a balance. What to do, then? The solution, of course, is in the hands of politics, but it also passes through individual behaviors and collective choices that empower all of us: Rosina illustrates here the first, decisive steps to be taken to keep the future of the new generations open.