Based on your information, your BMI is approximately 34.8, calculated using your weight of 209 pounds and height of 5 feet 5 inches. This places you in the obesity category, which is a key consideration for determining eligibility for gastric bypass surgery. To qualify for this type of surgery, most guidelines require either a BMI of 40 or higher, or a BMI of 35-39.9 if you have obesity-related health conditions such as Type 2 diabetes, high blood pressure, sleep apnea, or severe acid reflux. Since your BMI is below 35, your eligibility would depend on whether you have any of these health conditions. Additionally, most bariatric programs require evidence that you have attempted other weight-loss methods, such as dietary changes and exercise, without achieving sustained results. Your age of 21 is well within the typical range for surgery eligibility, but it is important to assess whether you are prepared for the lifestyle changes and follow-up care that come with bariatric surgery.