The Growth and Diversity of Older Undocumented Immigrants in the United States.

The undocumented immigrant population in the United States is aging and diversifying by origin group. However, research on aging among undocumented immigrants focuses on Mexicans and Central Americans, even as this population declines, and less is known about other groups. We analyze residual estimates of the undocumented population and the 2018‒2022 panels of the Survey of Income and Program Participation to document trends in age at arrival, duration in undocumented status, and socioeconomic and health correlates for undocumented immigrants across 27 countries or regions. We find dramatic increases in the older undocumented population across all origin groups, especially among those from Asia, the Caribbean, Europe, Canada, and Oceania. Aging in place drives population aging among the largest groups-those from Mexico, Central America, Venezuela, and India-while both aging in place and increases in arrivals at older ages are responsible for population aging among those from other origins. Additionally, undocumented status for older immigrants from most origins is associated with significant socioeconomic disadvantage regardless of age at arrival, but especially for those who age in place. This finding foreshadows rising inequality by legal status among America's seniors as the most disadvantaged immigrant groups age in place in coming decades.