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 lessons ( lesson_id number, customer_id number, lesson_status_code text, staff_id number, vehicle_id number, lesson_date time, lesson_time text, price number )
TABLE: CREATE TABLE addresses ( address_id number, line_1_number_building text, city text, zip_postcode text, state_province_county text, country text )
TABLE: CREATE TABLE customer_payments ( customer_id number, datetime_payment time, payment_method_code text, amount_payment number )
TABLE: CREATE TABLE staff ( staff_id number, staff_address_id number, nickname text, first_name text, middle_name text, last_name text, date_of_birth time, date_joined_staff time, date_left_staff time )
TABLE: CREATE TABLE customers ( customer_id number, customer_address_id number, customer_status_code text, date_became_customer time, date_of_birth time, first_name text, last_name text, amount_outstanding number, email_address text, phone_number text, cell_mobile_phone_number text )
TABLE: CREATE TABLE vehicles ( vehicle_id number, vehicle_details text )

### Question ###
When are the birthdays of customer who are classified as 'Good Customer' status?

### Accurate SQL ###

SELECT date_of_birth FROM customers WHERE customer_status_code = 'Good Customer'