How much should someone weigh at the age of 14?

There is no particular weight that you should be as a 14-year-old (or at any age). Weight is related to height and body composition rather than age. Please feel free to ask the question again and include more detail. Alternatively, for more information about weight in relation to height, and to see the distribution of weights and heights of children at various stages, please see the page link, further down this page, listed under Related Questions.