CREATE TABLE table_train_87 ("id" INT, "gender" TEXT, "mini_mental_state_examination_mmse" INT, "rosen_modified_hachinski_ischemic_score" INT, "body_mass_index_bmi" FLOAT, "age" FLOAT, "NOUSE" FLOAT)

male or female between the ages of 21 and 90
SELECT * FROM table_train_87 WHERE (gender = 'male' OR gender = 'female') AND (age >= 21 AND age <= 90)
SELECT * FROM "table_train_87" WHERE "age" <= 90 AND "age" >= 21 AND ("gender" = 'female' OR "gender" = 'male')