According to the Centers for Disease Control and Prevention, the average weight of an American adult between 2007 and 2010 was 195.5 pounds for men and 166.2 for women. This data considers all adults over 20 years of age.
According to the same data set from the Centers for Disease Control and Prevention, males between 20 and 29 had an average weight of 183.9 pounds, while females in the same age group had an average weight of 161.9 pounds. Females between ages 40 and 49 had an average weight of 168 pounds, while men of that age averaged a weight of 200.6. Men between ages 50 and 59 had the highest mean weight of any age group.