We are in the midst of a demographic phenomenon known as the graying of society. In more affluent countries, the population is aging. According to the U.S. Census Bureau, the number of Americans aged 65 and older is projected to more than double by 2060. By 2030, 20% of the U.S. population will be over 65 years old. Some other countries, including Italy, Germany, and Japan, are already at this mark.

中文翻译：

---

机器人宠物：老年人最好的朋友？

我们正处于一种被称为社会老龄化的人口现象之中。在更富裕的国家，人口正在老龄化。根据美国人口普查局的数据，到 2060 年，65 岁及以上的美国人人数预计将增加一倍以上。到 2030 年，20% 的美国人口将超过 65 岁。其他一些国家，包括意大利、德国和日本，已经处于这个阶段。