CREATE TABLE table_27691 ("Country" TEXT, "Contestant" TEXT, "Age" FLOAT, "Height  ( cm ) " FLOAT, "Height  ( ft ) " TEXT, "Hometown" TEXT)

What is the number of contestants who are aged exactly 18?
SELECT COUNT("Contestant") FROM table_27691 WHERE "Age" = '18'
SELECT COUNT("Contestant") FROM "table_27691" WHERE "Age" = '18'