Setting an email account?

Recently, one of my friends told me that she had the idea of setting up an email account for her daughter. Reason being there are certain things that can't be blogged and shared in public. Therefore she had wanted to send email to her daugther and would disclose the existence of the email account to her when her daughter turns 21. The next day, she told me that yahoo account date of birth does not support year of birth 2007. I laughed til I flipped. Anyway, I thought that was a sweet idea and was seriously thinking of doing that. :P