How many clients under the age of 35 gave Eagle National Mortgage 1 star?
age < 35; Eagle National Mortgage refers to Product = 'Eagle National Mortgage';
SELECT COUNT(T2.age) FROM reviews AS T1 INNER JOIN client AS T2 ON T1.district_id = T2.district_id WHERE T1.Product = 'Eagle National Mortgage' AND T1.Stars = 1 AND T2.age < 35