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The changing population age structure has a significant influence on the economy, society, and numerous other aspects of a country. This paper has innovatively applied the method of compositional data forecasting for the prediction of population age changes of the young (aged 0–14), the middle-aged (aged 15–64), and the elderly (aged older than 65) in China, India, and Vietnam by 2030 based on data from 1960 to 2016. To select the best-suited forecasting model, an array of data transformation approaches and forecasting models have been extensively employed, and a large number of comparisons have been made between the aforementioned methods. The best-suited model for each country is identified considering the root mean squared error and mean absolute percent error values from the compositional data. As noted in this study, first and foremost, it is predicted that by the year 2030, China will witness the disappearance of population dividend and get mired in an aging problem far more severe than that of India or Vietnam. Second, Vietnam’s trend of change in population age structure resembles that of China, but the country will sustain its good health as a whole. Finally, the working population of India demonstrates a strong rising trend, indicating that the age structure of the Indian population still remains relatively “young”. Meanwhile, the continuous rise in the proportion of elderly population and the gradual leveling off growth of the young population have nevertheless become serious problems in the world. The present paper attempts to offer crucial insights into the Asian population size, labor market and urbanization, and, moreover, provides suggestions for a sustainable global demographic development. [ABSTRACT FROM AUTHOR]

Accompanying the ageing of contemporary ageing societies is an increase in age associated morbidity, with dementia having an important impact. Mental frailty in later life is a source of fear for many and a major policy concern to all those concerned with health and welfare services. This introduction to the special issue on 'Ageing, dementia and the social mind' situates the selected papers within the context of debates about dementia and its social relations. In particular it draws attention to the importance of the social imaginary of the fourth age and what this means for the issue of personhood, care, social representations of dementia and its social contextualisation. The papers illuminating these themes draw on a variety of disciplines and approaches; from the social sciences to the humanities and from the theoretical to the empirical in order to help orientate future researchers to the complexities of dementia and the social and cultural matrix in which it exists. This paper provides an introduction to the potential for a more extended sociology of dementia; one which could combine the insights from medical sociology with the concerns of social gerontology. [ABSTRACT FROM AUTHOR]