SELECT SQL QUERY USING CURRENT DATE TIMETO GET THE USERS AGE?

Hi,
I have a datable with a Field Birthday which is of Type DateTime and stores the Users Birth date.
On my aspx page, I want to display the users if there age is between 1 and 14 by calculating 
their age getting the Current date time?
How would I write the SQL query and could I assign the resuls into one group?
Thank you
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