function calculateAge() {
var birthdate = new Date(document.getElementById("birthdate").value);
var today = new Date();
var age = today.getFullYear() - birthdate.getFullYear();
var monthDiff = today.getMonth() - birthdate.getMonth();
if (monthDiff < 0 || (monthDiff === 0 && today.getDate() < birthdate.getDate())) {
age--;
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