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 Person ( name varchar(20), age INTEGER, city TEXT, gender TEXT, job TEXT )
TABLE: CREATE TABLE PersonFriend ( name varchar(20), friend varchar(20), year INTEGER )

### Question ###
What is the average age for each gender. Visualize by bar chart.

### Accurate SQL ###

SELECT gender, AVG(age) FROM Person GROUP BY gender