diff --git a/scripts/about.js b/scripts/about.js
index cf699ae..d90b043 100644
--- a/scripts/about.js
+++ b/scripts/about.js
@@ -50,7 +50,8 @@ for (question of questions) {
 $('#about-list').html(a);
 
 function getAge() {
-    let birthdate = new Date("1999-05-21");
-    let age = new Date(Date.now()).getUTCFullYear() - birthdate.getUTCFullYear();
-    return age;
+    let birthdayMillis = Date.UTC(1999, 05, 21);
+    let todayMillis = Date.now();
+    let ageSinceStart = new Date(todayMillis - birthdayMillis);
+    return ageSinceStart.getUTCFullYear() - 1970;
 }
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