The COVID-19 pandemic has disrupted the lives of many people in many ways. For young people who were becoming adults, it may have disrupted or delayed moves out of education and into employment, or from living with parents to forming families. This may have long-term implications for their lives and mental health. We will combine information from three surveys that followed people from their youth into adulthood before the pandemic, with information from a survey of young people who were just becoming adults as the COVID-19 pandemic happened. In doing so, we aim to find out what impact the COVID-19 pandemic has had on the economic and family situations of this generation of young adults, and what the longer- term impacts of this on their mental health could be.