By trying to sign in to AdobeRevel I was quite surprised that you requested a date of birth. Why??
The software asks for your date of birth to confirm that you are over the age of 13. This information is part of the terms of the software agreement http://www.adobe.com/misc/terms.html
3.2 You may not use the Services if (a) you are prohibited by Law from receiving or using the Services, (b) you are not fully able and competent to enter into a binding contract with Adobe, such as if you are not of legal age or have not obtained parental consent. In particular, unless expressly stated otherwise in the Additional Terms for any given Service, you affirm that you are over the age of 13 and acknowledge that these Services were not intended for children under 13.