Setting aside the fact that the populations of highly industrialized countries may be considerably influenced by influx of refugees, the assumption can (or must) be that the population of the industrialized countries is stagnating. On the other hand, the population's demographic composition will change radically. While the proportion of young people will fall drastically in the coming years, the percentage of senior citizens will increase by up to 1% per year. With the contraceptive pill we started an experiment that is unique in human history and whose consequences will leave their mark on the 21st century. There will be fewer and fewer young people and more and more active 'younger senior citizens' with time and money on their hands who will set the tone in the leisure and travel market.