I don’t use my real birthday on any websites, I hide the fake birthday where that’s possible (Facebook thinks I’m well into my second century on Earth). I never accept “birthday” app requests, please don’t send them. It’s safer that way, I also never reveal my pornstar name in public (combine your first pet’s name with your mother’s maiden name). I also think you should keep your travel and party plans offline and post photos after the event. Don’t post your phone number or home address either.
I’m not being grumpy, just trying to stay secure, I suggest you think about what you share online, you really don’t know who’s watching or to what exploit they might be able to put your private info. Meanwhile, feel free to wish me a Happy Birthday any day of the year, one day you will be right!