Compare Dates ASP Classic SQL Server 11.0.5058.0

Comparing two datetime fields and the following statement returns 0 regardless of birthdate

<%
Dim overage
If rs_student_list.Fields.Item("grade") = 8 AND rs_student_list.Fields.Item("birthdate") > rs_school.Fields.Item("grd_8_age") Then
overage = 1
ElseIf rs_student_list.Fields.Item("grade") = 7 AND rs_student_list.Fields.Item("birthdate") > rs_school.Fields.Item("grd_7_age") Then
overage = 1
ElseIf rs_student_list.Fields.Item("grade") = 6 AND rs_student_list.Fields.Item("birthdate") > rs_school.Fields.Item("grd_6_age") Then
overage = 1
Else
overage = 0
End If 
%>