The average time to develop serious immunodeficiency in HIV positive person is 10-15 years. No studies can be found about the average life length after infection in HIV positive people. Because the HIV attacks the immune system, even very weak and usually harmless infection can be fatal. This would need a severe immunodeficiency to develop. Once it is developed, every infection is extremely dangerous. Also, the immune system is in charge for protection against tumors and the probability of developing malignant tumor rapidly increases in people with severe immunodeficiency caused by HIV.