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The topic of older adult loneliness commands increasing media and policy attention around the world. Are surveys of aging equipped to measure it? We assess the measurement of loneliness in large-scale aging studies in 31 countries by describing the available measures, testing correlations between them, and documenting their construct validity. We use data from several "sister studies" of aging adults around the world. In each country, we document available loneliness measures, test for measurement reliability by examining correlations