Since Google Plus is no more, it was dead, here is an update for users coming to this page: Google birthday Surprise Spinner

So you can try this, to see special Google doodles for you and wishes from Google on its homepage, sign in to Google plus, visit Personal info in Account Settings Page > Edit Profile > Basic Information, click on ‘Edit’ and set your date of birth, save the changes and visit Google homepage.

New Cleaner Gmail Profile Cards With Google+ Integration If you have fully filled in your profile info, then Google’s special surprise doodle will appear on Google’s homepage supposing that you already signed into your Google profile. Google started showing happy birthday doodle and some flare on the profile page. I went ahead and selected the “Contact Info” tab and for my birthday chosen October as the month and the date as today’s and clicked “save changes”. Since I thought there are privacy issues with the Google profile, I haven’t created one till now, today I tested by creating a profile for my Google account (I provided only my first and last name). Prevent Google From showing your Profile name and Photo in their Ads Don’t be surprised Google wants to wish happy birthday with a special doodle to every user, who has entered the date of birth in their Google profile, so supposing today is your birthday when you sign in to your Google profile, a special doodle will appear on Google homepage, clicking on that doodle will show happy birthday wishes from Google on your profile page (check the screenshot below).

Google birthday surprise spinner wheel