Gruber-Baldini, Schaie, and Willis (1995) found that married couples became increasingly similar over time in terms of:

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Gruber-Baldini, Schaie, and Willis (1995) found that married couples became increasingly similar over time in terms of attitudes and mental abilities. The study did not mention physical appearance or emotional expression as factors that become more similar over time.

Gruber-Baldini, Schaie, and Willis (1995) Found That Married Couples Became