Simplify the birthdate system

When buying , simplex is third party you have to use with a credit card. And it asks for birthdate. Why can’t you just type in the birthdate? No, you have to keep hitting the backup button to get your date. People are 30-40-50+ years of age. And I have to hit the freakin button over 480 times to get to my birthdate. So stupid and time consuming. What if credit card not work. Add a different one… hit button over 480 times to get to the birthdate.
Please change it.