Hey there Joanne,
Welcome to planDisney and thanks so much for your question! As a fellow September birthday celebrator - happy early birthday!
While free tickets when visiting on your birthday is not an option (I wish!!) - there are still plenty of ways to
celebrate your big day.
First and foremost, you're going to want to pick up a complimentary birthday button, which you can find at the check out locations of most retail locations around the parks. While wearing this, you'll be bombarded (in the best way) with birthday wishes throughout your visit.
Second, if you're staying at a Disneyland Resort hotel you can
celebrate with an in-room celebration, and/or if you're enjoying a dining at a location in the parks you can
order a cake for your table.
Thanks again for your question, Joanne! I hope you have a wonderful time celebrating your birthday at the Happiest Place on Earth.
Have a Magical Day,
Greg