While bulimia tends to peak between adolescence and early adulthood, the incidence and prevalence has shown an increase in all age groups. For instance, bulimia is increasing rapidly among prepubertal girls. Bulimia and associated weight concerns are beginning at earlier ages, with concerns of body weight and image emerging in girls as young as nine years old. A recent study found that 70 percent of sixth-grade girls surveyed reported that they first became concerned about their weight between the ages of 9 and 11.
Bulimia is also becoming more common among elderly women. This is, in part, due to patients maintaining their illness into old age. Also, elderly women have been shown to initiate weight control practices, such as binging and purging.