preadolescence
noun
                                                                                                                            
                                                            pre·ad·o·les·cence
                    
                                                                                                              
                                                                                                                                  ˌprē-ˌa-də-ˈle-sᵊn(t)s 
                                                      
                                                          
            
                                
              
          
                                                      : the period of human development just preceding adolescence                                      
                
                                
            specifically                
          
                                                      : the period between the approximate ages of 9 and 12                                      
            
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  Merriam-Webster unabridged




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