title: PHP and SQL | Specific thing in query
body: <p>In DB I have a field that contains user's birthday. Example: 01.09.1994
  I have a PHP function that calculates of user's birth. 
  Now the thing that I want to do:
  I want to search all the users with age 18 for example, but I want to do this in the sql query. How can this happen? </p>
  
  <pre><code>"SELECT * FROM `users` WHERE `birth` = '18'"
  </code></pre>
  
  <p>How with sql to automatically turn the birth(01.09.1994) into ages, without getting the results and then turn the birthday in ages with php?</p>