Like many other wealthy nations, the United States is experiencing substantial population ageing, particularly among Whites, whose median age is over a decade older than Blacks' and Hispanics'. To date, analyses of this demographic divergence have been limited to national and state levels; we know little about its manifestation at smaller scales. This study introduces three micro-level measures of the joint distribution of age and race, demonstrating that Whites are older than their non-White neighbours in most integrated neighbourhoods, with notable variation across regional and local characteristics. Racial age gaps significantly predict subsequent declines in neighbourhoods' White population, indicating that racial change has an under-studied age dimension. Meanwhile, neighbourhoods with relatively younger Whites are rare, clustered in coastal metros, and linked to gentrification. Drawing on theories of multidimensional heterogeneity, I suggest that local consolidation of age and racial differences may undermine stable integration and reinforce inequality.

中文翻译：

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种族融合社区中年龄和种族的联合分布

与许多其他富裕国家一样，美国正在经历大量人口老龄化，尤其是白人，他们的中位年龄比黑人和西班牙裔大十多岁。迄今为止，对这种人口差异的分析仅限于国家和州一级；我们对它在较小规模上的表现知之甚少。本研究介绍了年龄和种族联合分布的三个微观层面的衡量标准，表明在大多数综合社区中，白人比他们的非白人邻居年长，在区域和地方特征之间存在显着差异。种族年龄差距显着预测了社区白人人口随后的下降，这表明种族变化有一个未被充分研究的年龄维度。与此同时，白人相对年轻的社区很少见，聚集在沿海大都市，并与高档化有关。借鉴多维异质性理论，我认为年龄和种族差异的局部合并可能会破坏稳定的融合并加剧不平等。