下面你将听到一段有关人口老龄化问题的讲话。

The world’s population is ageing: virtually every country in the world is experiencing growth in the number and proportion of older persons in their population. Population ageing is poised to become one of the most significant social transformations of the twenty-first century, with implications for nearly all sectors of society, including labour and financial markets, the demand for goods and services, such as housing, transportation and social protection, as well as family structures and intergenerational ties. According to statistics, the number of older persons—those aged 60 years or over—is expected to more than double by 2050 and to more than triple by 2100, rising from 962 million globally in 2017 to 2.1 billion in 2050 and 3.1 billion in 2100. Globally, population aged 60 or over is growing faster than all younger age groups. //
    In 2017, there are an estimated 962 million people aged 60 or over in the world, comprising 13 percent of the global population. The population aged 60 or above is growing at a rate of about 3 percent per year. Currently, Europe has the greatest percentage of population aged 60 or over(25 percent) . The number of older persons in the world is projected to be 1.4 billion in 2030 and 2.1 billion in 2050, and could rise to 3.1 billion in 2100. Globally, the number of persons aged 80 or over is projected to triple by 2050, from 137 million in 2017 to 425 million in 2050. By 2100 it is expected to increase to 909 million, nearly seven times its value in 2017. //
    The size and age composition of a population are determined jointly by three demographic processes: fertility, mortality and migration. All regions have experienced substantial increases in life expectancy since 1950. As the life expectancy at birth increases, improvements in survival at older ages account for a growing proportion of the overall improvement in longevity. While declining fertility and increasing longevity are the key drivers of population ageing globally, international migration has also contributed to changing population age structures in some countries and regions. In countries that are experiencing large immigration flows, international migration can slow the ageing process, at least temporarily, since migrants tend to be in the young working ages. However, migrants who remain in the country eventually will age into the older population. //
    Older persons are increasingly seen as contributors to development, whose abilities to act for the betterment of themselves and their societies should be woven into policies and programs at all levels. In the coming decades many countries are likely to face fiscal and political pressures in relation to public systems of health care, pensions and social protections for a growing older population. To begin addressing these issues, the General Assembly convened the first World Assembly on Ageing in 1982, which produced a 62-point International Plan of Action on Ageing. It called for specific action on such issues as health and nutrition, protecting elderly consumers, housing and environment, family, social welfare, income security and employment, education, and the collection and analysis of research data. //
    In 1992, the UN General Assembly declared 1999 the International Year of Older Persons. The International Day of Older Persons is celebrated on 1 October every year. Action on behalf of the ageing continued in 2002, when the Second World Assembly on Ageing was held in Madrid. Aiming to design international policy on ageing for the 21st century, it adopted a Political Declaration and the Madrid International Plan of Action on Ageing. The Plan of Action called for changes in attitudes, policies and practices at all levels to fulfil the enormous potential of ageing in the twenty-first century. Its specific recommendations for action give priority to older persons and development, advancing health and well-being into old age, and ensuring enabling and supportive environments. //
                                                                                                                                        (原文来源：《联合国日常议题：老龄化》)