CREATE TABLE PersonFriend (name VARCHAR, friend VARCHAR, year INT)
CREATE TABLE Person (name VARCHAR, age INT, city TEXT, gender TEXT, job TEXT)

How old is each gender, on average Plot them as bar chart, and rank from high to low by the gender.
SELECT gender, AVG(age) FROM Person GROUP BY gender ORDER BY gender DESC
SELECT "gender", AVG("age") FROM "Person" GROUP BY "gender" ORDER BY "gender" DESC NULLS LAST