Bao Yi, a 73-year-old Shanghai retiree, is part of China’s first generation of so-called DINK couples, short for “double income,...

Bao Yi, a 73-year-old Shanghai retiree, is part of China’s first generation of so-called DINK couples, short for “double income, no kids” — people who grew old without children in a society where marriage was long expected to lead to parenthood, and children to care for aging parents.

Now, in a rapidly aging China, that generation is confronting a question once easier to ignore: what does old age look like without children to rely on?

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