What is normally the average weight for a 26 year old male around 5'9-6'0"?

There's a Range: There's a range of normal that is typically defined using a measure called the body mass index (BMI). Check out this link: http://www.bmi-calculator.net

136 - 184 lbs.: Average body weight, depends on your frame. A better measurement of "healthy" weight would be based on your body mass index (BMI) as ~25% of adults are overweight (BMI>25) or obese (BMI >30). Healthy BMI is 20 - 25, but varies from person to person, so don't get stuck on this number. 184 lbs. is "overweight" for a 6'. Use good habits

Multiple studies: Based on the Miller formula (1983), your ideal weight is 155.0 lbs Based on the Devine formula (1974), your ideal weight is 160.9 lbs Based on the Hamwi formula (1964), your ideal weight is 165.3 lbs Based on the healthy BMI recommendation, your recommended weight is 128.9 lbs - 174.2 lbs Check out ideal weight calculator online

Depends: According to an ideal weight table a male 5 feet 9 inches can weigh from 136 to 169. A 6 foot male can weigh 148 to 184. As you see there is a lot of variability. Note these weights do not take into account bone mass and muscle. I would go to a Doctor who has a device to measure fat percentage. Males with a body fat percentage of 12 to 20 percent are generally healthy. I hope this helps.

About: 180-185 Pounds.