Yes, it matters because it tells the users as well as Twitter itself to filter the content for you according to your age group. Twitter have set some limits on some age groups and date of birth helps X to figure out the right audience of age group . You can also change the date of birth after the creation of the account. This is quite a simple task that you can do it from your profile section Read the complete steps to change the date of birth: https://ityug247.com/how-to-change-birthday-on-twitter/
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