"use strict";

{
    // Month index must be two because counting begins at 0 (for January)
    const myBirthDate = new Date(2001, 2, 29);
    const today = new Date();

    let yearsSinceBirth = today.getFullYear() - myBirthDate.getFullYear();

    // Correct yearsSinceBirth if between New Year and my birthday
    if (today.getMonth() < myBirthDate.getMonth())
        yearsSinceBirth--;
    else if (today.getMonth() == myBirthDate.getMonth()
             && today.getDate() < myBirthDate.getDate())
        yearsSinceBirth--;

    document.getElementById('age-display').innerText = yearsSinceBirth.toString();
}