function add_years(dt,n)   
 {  
 return new Date(dt.setFullYear(dt.getFullYear() + n));        
 }  
  
dt = new Date();  
console.log(add_years(dt, 10).toString());    
  
dt = new Date(2014,10,2);  
console.log(add_years(dt, 10).toString()); 