Search by age where date is in field

Question

I am creating search and reselt page with session.
Members are with birthdate in field, I did convert birthdate
in to number with datediff().
It converts, But when I use this it gives error.
<cfif session.search.agefrom is not "">
and #dateDiff("yyyy", e.birthdate, Now()))# >=
#Session.Search.AgeFrom#
</cfif>
This is part of code I did.
It gives error and doesn't recognise e.birthday even though
it is.
If I just use e.birthday it works.
Do I need to add another query in query?
If so Will you please help me?

Answer 1

This is copy of code I wrote!
<cfquery name="get_Partner" datasource="marriage1">
SELECT f.Memb_ID, f.Memb_Gend, f.Scre_Name, f.Memb_City,
f.Memb_Stat, f.Memb_Coun, e.Birt_Date, e.Smal_Imag
FROM Memb_Info f INNER JOIN Memb_Prof_11 e
ON e.Memb_ID = f.Memb_ID
WHERE
0=0
<cfif SESSION.Search.userFilter is not "">
AND (f.Memb_Coun LIKE '%#SESSION.Search.userFilter#%' OR
f.Memb_Stat LIKE '%#SESSION.Search.userFilter#%')
</cfif>
<!--- Also filter on From date, if provided --->
<cfif isDate(SESSION.Search.dateFrom)>
AND e.Birt_Date >= #dateDiff("yyyy",
Session.search.datefrom, now())#
</cfif>
<!--- Also filter on Through date, if provided --->
<cfif isDate(SESSION.Search.dateThru)>
AND e.Birt_Date <= #dateDiff("yyyy",
Session.search.datefrom, now())#
</cfif>
What I want is enter age like 25, 30, and so on in search
field where field has date information.