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_name_23 (age_as_of_1_february_2014 VARCHAR, province_or_country_of_birth VARCHAR)

### Question ###
What is the average age as of February 1, 2014 for the supercentenarians born in the United States?

### Accurate SQL ###

SELECT age_as_of_1_february_2014 FROM table_name_23 WHERE province_or_country_of_birth = "united states"