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Using a repeated cross-sectional design to trace marital success and failure in five American 10-year marriage cohorts from 1973 to 1994 reveals no convincing evidence of an increase in aggregate-level marital success at any duration in the first five decades after first marriage. The higher mean level of marital quality in late-term than in mid-term marriages shown by cross-sectional studies apparently results largely from cohort differences in marital success. (EXCERPT)
Norval D. Glenn (Sat,) studied this question.