The application consists in calculating the age of a person and the stage of human development in which they are.
The income of the years (Current Year / Birth Year) is made through drop-down lists.
The "Calculate" button calculates and displays the results in two text boxes, one indicating the age and the other the stage of human development.
If any of the years is not in the drop-down list, there is the option to add directly to the text box with just one click.