Background: Ventilator is a life supporting machine designed to replace or support normal respiratory function. Ventilator may be used to expand the lung and deliver oxygen to maintain lung function. Ventilator Associated Pneumonia (VAP) is defined as pneumonia happened in 48 hours or more after a mechanical ventilator is set. VAP is the most frequently seen nosocomial infection in Intensive Care Units, especially in patients using mechanical ventilator.Aim: To determine the correlation between the age of Ventilator Associated Pneumonia patients with length of stay in ICU Dr. Kariadi General Hospital Semarang.Methods: This study was an observational analytic using cross-sectional design. Samples were 29 patients using mechanical ventilator in Dr. Kariadi Hospital's ICU with positive VAPs. Obtained data were analyzed using Spearman test to find the association between patients' age with length of stay.Results: From 29 samples it was obtained that VAP patients' average age was 49,07 ± 13,496 and average length of stay was 12,21 ± 9,578. Spearman test resulted in p = 0,875 and r = -0,031.Conclusion: There was no significant correlation between VAP patients' age with length of stay in Dr. Kariadi Hospital's Intensive Care Units