CD4 and AIDS: Also, as can be clearly seen from the hazard function plot of peak CD4 (Fig. 3), when patients were the same age and had low CD4 counts, their cumulative risk of death was higher.The cumulative risk of death from HIV/AIDS did not show a statistically significant difference among patients between the ages of 20 and 40, but these differences gradually became more significant among patients over the age of 40.