Do Red blood cells or white blood cells have the longest circulating life span?

Red blood cells (RBCs) have a longer circulating lifespan compared to white blood cells (WBCs). RBCs typically survive for about 120 days in the bloodstream, while most WBCs have much shorter lifespans, ranging from a few days to a few weeks, depending on the type. Therefore, red blood cells are the ones with the longest circulating lifespan.