What is the best time to start controlling my weight better?

PinkyPie
i turn 16 in 3 months and was wondering what is the best time to start working out more and dieting ?

I'm still growing and I want to loose a considerable amount of weight ( about 4-5 pounds maybe more I'm not fat but I moved countries recently and I've gained 5 pounds so non of my clothes fit ) and I'm worried that if I do diet will it get in the way of my body developing etc.

so what is the best time or age to start closely monitoring my weight ? and getting into a exercise routine ?
What is the best time to start controlling my weight better?
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