Gynecomastia is present in 60% to 90% of newborns and usually resolves within a few weeks.  Most pubertal boys develop gynecomastia, with average age of onset at 11 to 12 years. By 14 years, 60% of boys have gynecomastia.  This resolves in most cases within a few months. By age 19, the prevalence of gynecomastia is 5% to 15%. Gynecomastia is present in 33% to 41% of normal men ages 25 to 45 years and in 55% to 60% of men over the age of 50 years.   Most of these men are asymptomatic and are unaware that they have breast tissue. Gynecomastia is strongly correlated with the presence of obesity.  In an unselected group of hospitalized men, gynecomastia was found in 12% or less of men with body mass index below 19 kg/m^2, while over 80% of men with body mass index above 25 kg/m^2 had gynecomastia. Gynecomastia has been found in 45% to 50% of men in autopsy studies. 
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