A demographic change towards an increasing proportion of old and oldest - old in high-income countries has taken place since World War II (WW2). The past decades’ improved survival among older people is the main driving force, but it is further strengthened by declining birth rates and the large post-WW2 birth cohorts (‘the Baby Boomers’) entering the old age segment.¹ The increasing proportion of individuals reaching their 10^th and 11^th decade^2,3 is a success in terms of survival, but concerns have been expressed that this comes with a cost. The ‘Failure of Success’ hypothesis states that an increasing proportion of individuals surviving to very old ages (Success) will also show higher mean levels of disability and disease at these ages (Failure), thus challenging the welfare...

中文翻译：

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队列概况：1895年，1905年，1910年和1915年的丹麦队列研究-老年人的健康和功能方面的长期趋势

自第二次世界大战（WW2）以来，高收入国家的老年人口比例不断增加，人口发生了变化。过去几十年中老年人生存能力的改善是主要推动力，但随着出生率的下降和第二次世界大战后出生的大批婴儿（“婴儿潮”）进入老年段，这一点得到了进一步的增强。¹个人达到其10所述的比例越来越大^日和11^日的十年^{2 ，3}生存是成功的，但有人担心这要付出代价。成功失败的假设指出，越来越多的幸存者到很老的年龄（成功）还将在这些年龄表现出更高的平均残疾和疾病水平（失败），从而挑战了福利...