As of 2011, schizophrenia affects around 0.3% to 0.7% of people, or 24 million people worldwide, at some point in their lives. More men are affected than women: the number of males with the disorder is 1.4 times greater than that of females. Schizophrenia usually appears earlier in men. For males the symptoms usually start from 20 to 28 years of age, and in females it is 26 to 32 years of age. Symptoms that start in childhood, middle or old age are much rarer. Despite the received wisdom that schizophrenia occurs at similar rates worldwide, its rate of likelihood varies across the world, within countries, and at the local level. The disorder causes approximately 1% of worldwide disability adjusted life years (in other words, years spent with a disability). The rate of schizophrenia varies depending on how it is defined.