Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_64104 ( "School" text, "Location" text, "Mascot" text, "Size" real, "IHSAA Class" text, "# / County" text, "Year Joined" real, "Previous Conference" text )

### Question ###
What's the size of Centerville in 89 Wayne county with an IHSAA class of AA in the year before 1974?

### Accurate SQL ###

SELECT "Size" FROM table_64104 WHERE "Year Joined" < '1974' AND "IHSAA Class" = 'aa' AND "# / County" = '89 wayne' AND "School" = 'centerville'