Create object using function constructor Javascript

Creating a constructor function in JavaScript. This function has the name "Employee" and accepts a series of input parameters: name, yearBirth, gender.
Parameters use the "this" keyword to define a series of internal properties or methods "function" that will form a custom object.
A new instance called "employee1" can be created from the constructor function by using the new keyword.

<div id="show"></div>
<script>
  function Employee(name, yearBirth, gender) {
    //Private methods
    var age = function(yearBirth) {
      var current = new Date().getFullYear();
      return (current - yearBirth);
    };
    //Public properties
    this.name = name;
    this.yearBirth = yearBirth;
    this.age = age(this.yearBirth);
    this.gender = gender;
    //Public methods
    this.showMe = function() {
      document.getElementById('show').innerHTML = 
        'Hello, my name is '+this.name+' my age is '+this.age+' years old';
    };
  }

  var employee1 = new Employee('John', 2001, 'Male');
  employee1.showMe();
</script>