Do you ever read them?
Do you own anything with your birthstone?
Do you know your pet's birthday?
Do you remember other people's birthdays or do you have to write them down?
Have you ever had a surprise party?
What is your favorite superstition?
Do you fill out online quizes?
Most exotic animal you have ever petted? (people may count)
March For Science in April?
Quiz Which food holiday falls on your birthday?
Or any day. YMMV on the results