Add tested me.js for age

src/me.js

@@ -0,0 +1,21 @@
+module.exports = {
+  age: age,
+};
+
+function age() {
+  let birthdate = new Date(2002, 8, 29);
+  let now = new Date();
+
+  let age = now.getFullYear() - birthdate.getFullYear();
+
+  if (now.getMonth() < birthdate.getMonth()) {
+    age--;
+  }
+  if (
+    birthdate.getMonth() === now.getMonth() &&
+    now.getDate() < birthdate.getDate()
+  ) {
+    age--;
+  }
+  return age;
+}