Biological age is more important than chronological age in old patients. It is very important to access frailty in such cases. Frailty means increased physiologic vulnerability to stressors. It is associated with bad prognosis and really influences on the management of the patient. In our clinical case we observe some methods of frailty detection using methods of special geriatric assessment such as gait speed test, grip strength measuring and frailty index calculation. Our clinical case is just a look to a problem of frailty in old patients that are candidates to cardiac surgery. It reflects the use of conservative therapy in patients with need for cardiac surgery making the operation impossible because of very high operative risk.