This report from the Australian Longitudinal Study on Women's Health (ALSWH) presents data on the weight of three age cohorts of Australian women (Younger, Mid-age and Older) over the first 11 years of the study. The report investigates the trends in women's weight, height and body mass index (BMI), the predictive factors of weight change, and the effects of weight and weight change on women's health and health care usage. Data includes the number of women by BMI category and physical activity, the mean weight, height and BMI for the three age cohorts.