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_41 (population__1960_ INTEGER, county VARCHAR, population__2000_ VARCHAR)

### Question ###
What was Oslo's population in 1960, with a population of 507,467 in 2000?

### Accurate SQL ###

SELECT AVG(population__1960_) FROM table_name_41 WHERE county = "oslo" AND population__2000_ > 507 OFFSET 467