In 2011, survey analysis from the "Longitudinal Study of American Youth" found Gen Xers (defined as those who were then between the ages of 30 and 50) to be "balanced, active, and happy" in midlife and as achieving a work-life balance. The Longitudinal Study of Youth is an NIH-NIA funded study by the University of Michigan which has been studying Generation X since 1987. The study asked questions such as "Thinking about all aspects of your life, how happy are you? If zero means that you are very unhappy and 10 means that you are very happy, please rate your happiness." LSA reported that "mean level of happiness was 7.5 and the median (middle score) was 8. Only four percent of Generation X adults indicated a great deal of unhappiness (a score of three or lower). Twenty-nine percent of Generation X adults were very happy with a score of 9 or 10 on the scale."