* Italy and Japan are often cited as prime examples of countries with rapidly ageing populations and very low birth rates. Both countries have been grappling with the economic and social consequences of these demographic trends for several years. * South Korea has also emerged as a country with significant demographic concerns. Its fertility rate is one of the lowest in the world, and its population is projected to start declining in the coming years. * Nigeria and South Africa, while facing their own set of demographic challenges, are generally not highlighted for low birth rates or declining populations. Nigeria has a very young and rapidly growing population. South Africa’s population growth has slowed in recent years, but it is not yet experiencing a decline.