This study investigates the relationship between childhood financial hardship, lifetime earnings, and multimorbidity in older adults, using data from 7,305 participants aged 50 and older. Results indicate that childhood financial hardship is associated with an increased number of chronic conditions, while higher lifetime earnings are linked to fewer chronic conditions, with the latter modifying the relationship between hardship and multimorbidity. The findings highlight the need for further research into how socioeconomic factors throughout life influence health in older populations.