Plus, how to reverse brain shrinking.              
		              
		              
		              
		              
		              
		              
		              
		              
		
		
    
   
    
        
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| PHOTOGRAPH BY Britt Erlanson, Getty Images |  |  |  |  |  | 
            
              
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                      | The brains of superagers are different from the rest of us. Here's what 25 years of research reveals about why some people remain sharp well into their 80s and 90s. |  |  |  |  | 
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| PHOTOGRAPH BY SERGIY BARCHUK |  |  |  |  |  |  |  |  | 
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| PHOTOGRAPH BY REBECCA HALE, NATIONAL GEOGRAPHIC |  |  |  |  |  |  |  |  | 
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