Post-reform China has been experiencing two major demographic changes: an increasingly aging population and an extraordinary surge of rural-urban migrants. The question we ask is: are these two demographic changes related? If yes, then, how? The standard view in the migration literature is that the older the migrant, the lower the likelihood of migration. This paper proposes a simple theory of temporary migration for unskilled labor to fit the context of China. Motivated by our model, we then use both cross-sectional micro data and panel macro data to examine the potential impacts of aging on migration. We find that shifts in China’s age distribution have generated significant changes in the country’s migration patterns: migration will shift to closer provinces (probably switching from interprovincial migration to intra-provincial migration) and will concentrate to a few destination provinces.