Most Asian populations are ageing, but the degree varies considerably. Patterns of ageing since 1950 show six relatively homogeneous geographically-defined groups. The causes of ageing are demographic transition and emigration. Rapid economic development and demographic transition are associated with advanced ageing, while warfare and slow development are associated with delayed demographic transition and reverse ageing. The consequences of population ageing include two main social security challenges: retirement income support and personal care provision. Traditional support systems are uncertain in the context of increased longevity, small families, changed gender relations, out-migration for employment and the modern economy. However, th...