Answer:
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Burns are classified into four(4) classification, first degree, second degree, third degree and the fourth degree. First degree burns affects only the outer layer of our skin, the second degree affects our epidermis, the third degree destroys the dermis and epidermis and lastly the fourth degree damages the bones, muscles and tendons in our body.
        
                    
             
        
        
        
Some useful cold weather safety devices are layers, adequate hydration, insulating shoes, adequate provisions(food). All will help you avoid hypothermia.
        
             
        
        
        
There is no age to it really, But when you continuously eat, the disorder happens. Age is really not confirmed,
I hope I answered your question :)  <span />