title: How can I use my getAge() method
body: <p><img src="https://i.stack.imgur.com/sVvHm.png" alt="enter image description here"></p>
  
  <p>I have to make this AgeDiscount class, which have a method that generates a Age Discount. So if I am 21 years old, I will get a discount of 21%.</p>
  
  <p>So I need use my getAge from my Customer class. But I don't know how to pick it up?</p>
  
  <pre><code>public class AgeDiscount implements Discount {
  
      @Override
      public double getDiscountedPrice(double originalPrice) {
  
          return originalPrice;
      }
  
  }
  </code></pre>