Each cell has a specific lifespan. Cell lifespan depends on environmental conditions and genetic regulation or genetic clock. The life span of bacteria is a few hours. The life span of intestinal lining cells is 2-4 days. The average lifespan of a human cell is 10-12 days. White blood cells live for 1-15 days, platelets for 8-12 days and red blood cells for 120 days. Muscle and blood cells live throughout life.
