There is no way around the numbers: according to the World Health Organisation, the population of people aged over 65 will have increased by 2.5 times between 2010 and 2050, and in just a few decades, the majority of the urban population will be over 40. Population ageing has become a characteristic trend in developed countries but is now becoming a growing concern for developing countries as well. The City of Moscow is becoming more focused on dealing with this new reality and launched a programme earlier this year to expand the range of leisure services for its senior citizens, called "Moskovskoye Dolgoletiye" (Moscow Longevity). Nonetheless, the potential challenges of an ageing population are much more varied, along with the potential benefits for senior citizens themselves and for the city as a whole. The time has come for megacities to initiate a public discussion to exchange their ideas and experiences.