How can I list the function.

I know the function is there.
What am I doing wrong?

galvdb=#
galvdb=# \df+ delete_old
List of functions
Result data type | Schema | Name | Argument data types | Owner | Language | Source code | Description
------------------+--------+------+---------------------+-------+----------+-------------+-------------
(0 rows)

galvdb=# select delete_old();
delete_old
------------
482
(1 row)

galvdb=# select version();
version
-------------------------------------------------------------------------------------
PostgreSQL 8.2.0 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.3.3 (SuSE Linux)
(1 row)

galvdb=#

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