Diferencia de edades

Mi experimentación

<meta charset="utf-8">

<script type="text/javascript">


    //Print break
    function lineBreak() {

        document.write("<br>")
        document.write("<br>")

    };

    //Print phrase
    function prnt(phrase) {
        document.write(phrase);
        lineBreak();
    };

    var year = 2022;

    var nameK = "Kaozidd";
    var nameF = "Fanny";
    var nameS = "Sara";

    var ageKaozidd = 26;
    var ageFanny = 29;
    var ageSara = 30;

    var sumAge = ageKaozidd+ageFanny+ageSara;

    var avrg = (sumAge)/3;


    //Printing the siblings' ages
    prnt(nameK + "'s age is " + (year - 1996));
    prnt(nameF + "'s age is " + (year - 1993));
    prnt(nameS + "'s age is " + (year - 1992));


    //Adding the ages together
    prnt("<h3>The sum of their ages is: " + sumAge + "</h3>");

    //Printing birth years
    prnt(nameK + " was born in: " + (year - ageKaozidd));
    prnt(nameF + " was born in: " + (year - ageFanny));
    prnt(nameS + " was born in: " + (year - ageSara));

    //Averaging the ages
    prnt(
        "<h3>The average of " + 
        nameK + 
        ", " +
        nameF + 
        ", and " +
        nameS +
        "' age is: " 
        + Math.round(avrg) +
        "</h3>"
    );

    //Calculating the difference of age between siblings
    prnt("<h3>" + nameK + "'s " + (ageSara-ageKaozidd) + " years younger than " + nameS);
    prnt("<h3>" + nameK + "'s " + (ageFanny-ageKaozidd) + " years younger than " + nameF);
    prnt("<h3>" + nameF + "'s " + (ageSara-ageFanny) + " years younger than " + nameS);

</script>