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 Has_amenity ( dormid INTEGER, amenid INTEGER )
TABLE: CREATE TABLE Student ( StuID INTEGER, LName VARCHAR(12), Fname VARCHAR(12), Age INTEGER, Sex VARCHAR(1), Major INTEGER, Advisor INTEGER, city_code VARCHAR(3) )
TABLE: CREATE TABLE Lives_in ( stuid INTEGER, dormid INTEGER, room_number INTEGER )
TABLE: CREATE TABLE Dorm ( dormid INTEGER, dorm_name VARCHAR(20), student_capacity INTEGER, gender VARCHAR(1) )
TABLE: CREATE TABLE Dorm_amenity ( amenid INTEGER, amenity_name VARCHAR(25) )

### Question ###
Find the average age of all students living in the each city Show bar chart, order from high to low by the x axis.

### Accurate SQL ###

SELECT city_code, AVG(Age) FROM Student GROUP BY city_code ORDER BY city_code DESC