feat: ✨ add age calculator method

src/mixins/Helper.js

@@ -12,6 +12,25 @@ export default {
       }
     },
 
+    getAge(dateOfBirth) {
+      const today = new Date();
+
+      const thisYear = today.getFullYear();
+      const thisMonth = today.getMonth();
+      const thisDay = today.getDate();
+
+      const dobYear = dateOfBirth.getFullYear();
+      const dobMonth = dateOfBirth.getMonth();
+      const dobDay = dateOfBirth.getDate();
+
+      let age = thisYear - dobYear;
+
+      if (thisMonth < dobMonth) age--;
+      if (thisMonth === dobMonth && thisDay < dobDay) age--;
+
+      return age;
+    },
+
     toImperial(cm) {
       const realFeet = (cm * 0.3937) / 12;
       const feet = Math.floor(realFeet);