Age find using DOB in textbox vb6.0

Question

when i use below query to find age using birth date it generate error as per below...

error

 

THE CONVERSION OF A VARCHAR DATA TYPE TP A DATETO,E DATA TYPE RESULTED IN AN OUT-OF-RANGE VALUE.

 

my code as per below..

i want to find age and display in textbox using entering DOB in textbox....

i have implement as per below... whats wrong kindly suggest....

If rs.state = adStateOpen Then rs.Close
rs.Open "Select DATEDIFF(YEAR,CONVERT(datetime,'" & txtBirthdate.Text & "',103),CONVERT(varchar,V_ISSUEDATE,103)) from MASTER_NEW", cn.Conn, adOpenDynamic, adLockOptimistic
txtAge.Text = rs("V_AGE") & ""