= Solution
Low-mass <main sequence> <stars> live for much of the <Milky Way>'s age, retaining representatives of many generations, while <phase mixing> disperses their birth associations around their orbits. In an approximately axisymmetric <galactic disk>, a sufficiently complete local census can therefore sample the mixed annular <stellar population> at the Sun's radius despite its small volume. \b[This is a representative local-radius sample, not automatically an unbiased whole-disc census]: different vertical <scale heights>, selection effects and radial migration require corrections when inferring integrated population fractions.
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