What is the definition of non modifiable risk factors?

Risk factors: Per the World Health Organization: " A risk factor is any attribute, characteristic or exposure of an individual that increases the likelihood of developing a disease or injury." Risk factors that are not modifiable might be your race, your sex, your age. See: http://www.who.int/topics/risk_factors/en/

Unable to control: A non-modifiable risk factor is one over which we have no control. Our weight, for example, is modifiable. Smoking is modifiable. Family history is not. Age is not.