What is the lifespan of a red blood cell?

The lifespan of a red blood cell is typically around 120 days, which is approximately 4 months. This lifespan is a result of the wear and tear that red blood cells experience as they travel through the bloodstream, delivering oxygen and removing carbon dioxide. After about 120 days, red blood cells become less efficient and are typically removed from circulation by the spleen and liver. This natural recycling process ensures that new, healthy red blood cells can continue to perform their critical functions effectively. Therefore, the answer indicates an understanding of the physiological processes involved in the life cycle of red blood cells.