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The Science of Losing Friends to Marriage and Kids: Why Circles Shrink on Schedule

4 the researchers behind it — When friends disappear into marriages and babies — or when you're the one who disappeared — the self-talk usually makes it personal: they chose the ne

Heidelberg University

Cornelia Wrzus

Known for:Meta-analytic work on how social networks change with age and life events across the life span

Key findings

  1. 2013

    Across 277 studies with 177,635 participants, the global social network increases up to young adulthood and then decreases steadily, with personal and friendship networks shrinking throughout adulthood. ↗

  2. 2013

    Normative life events pattern network change: transitions typical of young adulthood, such as marriage, reshape the network's composition, while the family network stays stable in size from adolescence to old age. ↗

University of Amsterdam

Matthijs Kalmijn

Known for:Life-course research on how marriage and parenthood reshape couples' friendship networks and social contacts

Key findings

  1. 2003

    In survey data on married and cohabiting couples, partners' friendship networks shrink and increasingly overlap over the course of the relationship — consistent with the dyadic withdrawal hypothesis, with joint couple-friends replacing personal friends. ↗

  2. 2012

    Longitudinal analyses that separate age, marriage, and parenthood effects show the transitions themselves reduce contact with friends — ruling out the idea that the decline merely reflects cohort differences or who selects into marriage. ↗

Utrecht University

Gerald Mollenhorst

Known for:Panel studies showing personal networks turn over roughly half their members every seven years

Key findings

  1. 2009

    Re-interviewing over 600 Dutch adults seven years after a first survey, Mollenhorst found network size stayed roughly stable while only about half of the original network members remained — and friendships depended heavily on the social contexts (work, school, clubs, neighborhoods) where people kept meeting. ↗

  2. 2014

    With Völker and Flap, he showed in Social Networks that about seventy percent of the confidants and practical helpers people named were no longer named seven years later, and that where a relationship is embedded — its social context — shapes whether it survives or is discontinued. ↗

University of Oxford

Robin Dunbar

Known for:The cognitive and time constraints on human social networks, and how friendships decay without active maintenance

Key findings

  1. 2011

    Following students for 18 months across the school-to-university transition, friendships that received less contact declined measurably in emotional closeness while kin relationships stayed stable — and decline was buffered by talking together for women and by shared activities for men. ↗

  2. 2018

    Friendship is an extremely costly relationship in time investment: emotional closeness declines when contact frequency drops, so a limited time budget forces trade-offs in who stays in the inner layers of a person's network. ↗

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