CREATE TABLE exhibition_record (exhibition_id DECIMAL, date TEXT, attendance DECIMAL)
CREATE TABLE artist (artist_id DECIMAL, name TEXT, country TEXT, year_join DECIMAL, age DECIMAL)
CREATE TABLE exhibition (exhibition_id DECIMAL, year DECIMAL, theme TEXT, artist_id DECIMAL, ticket_price DECIMAL)

Return the average and minimum ages across artists from the United States.
SELECT AVG(age), MIN(age) FROM artist WHERE country = 'United States'
SELECT AVG("age"), MIN("age") FROM "artist" WHERE "country" = 'United States'