title: compare age with birthdate in where clause
body: <p>how to compare age with birthdate in where clause? Somthing like this code:</p>
  
  <pre><code>myRepository.Where(x =&gt;
      fromAge &lt;= x.BirthDate.Age &amp;&amp; x.BirthDate.Age &lt;= toAge)
      .Select(x).toList();
  </code></pre>
  
  <p>Data Types:</p>
  
  <p>fromAge, toAge : int</p>
  
  <p>x.BirthDate: DateTime</p>