what is a good weight for bieng a skateboarder at 15 years old?
Age and sports are not determinant factors when it comes to weight. This is because weight is determined by your height. Check out for the ideal weight after getting your height on http://www.healthchecksystems.com/heightweightchart.htm.
What your hobby is doesn't matter, however your height and gender would be helpful to know.
Well I would say 130 maybe
this is ridiculous. you can be any amount of pounds besides overweight or obese