How do I print the age by calling the below methods only?

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Java

I have a Person class (saved as Person.java) . The code is given below.

public class Person {

    private int age1;

    public int getAge() {
        return age1;
    }

    public void setAge(int age1) {
        this.age1 = age1;
    }
}

Then i have a Employee class which takes Person as data type. Code is given below.(saved as Employee.java)

public class Employee {

    Person person;
    private String employeeName;

    public Person getPerson() {
        return person;
    }

    public void setPerson(Person person) {
        this.person = person;
    }

    public String getEmployeeName() {
        return employeeName;
    }

    public void setEmployeeName(String employeeName) {
        this.employeeName = employeeName;
    }
}

Then I have main method in a separate class Main (Main.java). Code is given below.

public class MainEmployee {

    public static Employee getEmployeeDetails() {
        Scanner s = new Scanner(System.in);
        Employee e = new Employee();
        Person p = new Person();
        System.out.println("Enter name:");
        e.setEmployeeName(s.nextLine());
        System.out.println("Enter age1:");
        p.setAge(s.nextInt());
        return e;
    }

    public static void main(String args[]) {
        Employee e1 = getEmployeeDetails();
        System.out.println("name:" + e1.getEmployeeName());
        System.out.println("pname:" + e1.getPerson().getAge());//here it's showing error
    }
}

What I have tried:

System.out.println("pname:"+e1.getPerson().getAge());

it's throwing NullPointException