求翻译：3．Slower growth is matched by a dramatic ageing of the population. People above the age of 60 now represent 13.3% of the total, up from 10.3% in 2000 (see chart). In the same period, those under the age of 14 declined from 23% to 17%. A continuation of these trends will place ever greater burdens on the working young who must support their elderly kin, as well as on government-run pension and health-care systems. China’s great “demographic dividend” (a rising share of working-age adults) is almost over.是什么意思？

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