Despite a general decline, early-age motherhood continues to manifest disproportionately among young women living in rural/remote Canada. Although public health interventions exist to ameliorate the negative impacts, key determinants of young mothers' well-being exist in sectors outside of health. Moreover, there is no clear understanding of how social context interacts with policy to enhance/detract from interventions. We undertook an ethnographic study in a northern Canadian city to investigate the impacts of sociocultural conditions and policy interventions on young mothers. "Ageing out" was identified as an important example of the intersection between social context and policy. "Ageing out" occurs when State-provided educational/income supports are removed because a young mother reaches the age of majority. Ageing out within unsupportive social contexts compounds negative consequences for young mothers, especially in relation to housing, parenting, and employment. The findings illustrate how some policy interventions have negative consequences that exacerbate health and social inequities. (Contains 1 note.)