The purpose of this study is to examine the heath status and health behavior of middle-aged Korean men and women. Even though there has been increased concern about extremely high mortality rate of Korean middle-aged men and mental health problems of middle aged women, there is a dearth of empirical studies which examine the health status and health behavior of middle-aged men and women in Korea. This study attempts to fill these gaps. Data gathered from 1,667 men and women aged between 30-59 are analyzed to examine the level of physical health, mental health, perceived health and health behavior and to explore the gender and age group differences in these aspects. The results show that there exist gender difference and age group difference in health status: Women are less healthy than men and as age increased health status declined. Women at their 50s are least healthy and most unhappy suggesting age and gender interaction in health status. There exist a gender difference in health behavior: Men have regular check-ups more frequently than women and exercise more. These results are discussed in terms of the gender differences in the experiences, social roles and life styles over the life course.