// useage is as follows
// <script javascript src="dave_age.js"></script>

var bday=25;
var bmo=3;
var byr=1985;
var byr;
var age;
var now = new Date();
tday=now.getDate();
tmo=(now.getMonth());
tyr=(now.getFullYear());


if((tmo > bmo)||(tmo==bmo & tday>=bday))
{age=tyr-byr}

else
{age=tyr-byr-1}

document.write(age);