What is the age of the patient with hypertension named Giovanni Russel?
age refers to SUBTRACT(strftime('%Y', deathdate), strftime('%Y', birthdate)); hypertension refers to conditions where DESCRIPTION = 'Hypertension';
SELECT strftime('%Y', T2.deathdate) - strftime('%Y', T2.birthdate) AS age FROM conditions AS T1 INNER JOIN patients AS T2 ON T1.PATIENT = T2.patient WHERE T2.first = 'Giovanni' AND T2.last = 'Russel' AND T1.DESCRIPTION = 'Hypertension'