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Well, the average weight for a 12yr old would be around 38ish-50kg. if you're only 145cm tall and 12 then 40kg wouldn't be too light, it would probably a bit over average. But it doesn't matter because once you reach your growth time (different for everyone) all your weight turns into height.

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14y ago
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Q: You are 12 and 145 cms tall is 40 kgs to light?
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