This paper shows that the age gap between spouses is not just a demographic detail, but a meaningful social and health signal linked to early childbirth, women’s mental health, intimate partner violence patterns, child outcomes, widowhood, and household power dynamics across very different societies. The full review is worth reading because it reveals where larger age gaps may increase vulnerability, where they paradoxically appear protective, and how modernization is reshaping one of the most overlooked structures inside marriage.
Abstract: This paper aims to synthesize multi-regional evidence regarding the determinants of spousal age gaps and their subsequent effects on maternal health, domestic stability, and socio-economic outcomes. The review utilises 80 original studies with 344361 total participants (topic deduplicated ΣN). This scoping review indicates that spousal age gap operates as a multi-domain demographic signal in the evidence map, with large gaps associated with a 17% higher hazard of early childbirth in Sub-Saharan Africa, poorer mental health in South Korea (odds ratios 1.32–2.24), and a spousal age gap greater than 5 years linked to higher odds of multiple under-five deaths in rural Iran (odds ratio 2.32). At the same time, larger husband-older gaps were consistently associated with lower reported intimate partner violence across 29 developing countries (odds ratios 0.65–0.76), suggesting that the directionality of effects is strongly context-dependent rather than uniform. Dominant research topics converged on reproductive timing, intrahousehold bargaining, intimate partner violence gradients, later-life mortality and widowhood, and a secular narrowing of age gaps alongside modernization, as seen in Malaysia (4.6 to 3.9 years) and Greece (approximately 5 to 3 years). Practically, the mapped evidence supports targeted screening of age-disparate couples for mental health risk and counselling on age gap within reproductive health programmes, particularly in South Asian and Sub-Saharan African settings. The most prominent uncertainty is the apparent paradox between reduced intimate partner violence and simultaneously elevated reproductive and psychosocial risks in large-gap unions, and future prospective, longitudinal research with harmonized age gap thresholds is needed to clarify the mediating roles of autonomy, social norms, and marriage-market conditions.
Final search date and database lock: 2026-04-19 10:49:27 CEST
Plan: Pro (expanded craft tokens; source: Semantic Scholar)
Source: Semantic Scholar
Total Abstracts/Papers: 167438
Downloaded Abstracts/Papers: 1000
Included original and non-original Abstracts/Papers (all): 87
Included original Abstracts/Papers (Vote counting by direction of effect): 80
Reference Index (links used in paper): 50
Total participants (topic deduplicated ΣN): 344361
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