A lot of people have tiny pouches in their colons that bulge outward through weak spots. Such a pouch is called: diverticulum (pouches = diverticula).
Diverticulosis is the condition of having diverticula. This condition starts to appear more in people as they age. At age 40 around 10 percent of Americans have diverticulosis. At age 60 about 50 percent have diverticulosis.