public class Person

{

    public string Name { get; set; }

    public int Age { get; set; }

    public Person(string name, int age)

    {

        Name = name;

        Age = age;

    }

    // Other properties, methods, events...

}

​

class Program

{

    static void Main()

    {

        Person person1 = new Person("Leopold", 6);

        Person person 3 = this.calculatePerson(person1);

    }

    public Person calculatePerson(Person x)

    {

        x.Age++;

        x.Name = "Old " + x.Name;

        return Person;

    }

}