## **Core Concept**
Non-modifiable risk factors for hypertension are those that cannot be changed or controlled by an individual's lifestyle or medical interventions. These factors are inherent and often related to genetic or demographic characteristics. Understanding these risk factors is crucial for early identification and management of hypertension.

## **Why the Correct Answer is Right**
The correct answer, **C. Age**, is a non-modifiable risk factor for hypertension. As individuals age, the vascular system undergoes natural changes that can lead to increased blood pressure. Arterial stiffness and decreased vascular compliance are common age-related changes that contribute to the development of hypertension. This risk factor cannot be altered by lifestyle changes or medical interventions.

## **Why Each Wrong Option is Incorrect**
* **Option A:** Obesity is considered a modifiable risk factor for hypertension. Lifestyle changes such as diet and exercise can help manage weight and subsequently reduce blood pressure.
* **Option B:** Physical inactivity is also a modifiable risk factor. Increasing physical activity levels can help lower blood pressure and improve overall cardiovascular health.
* **Option D:** Diet high in salt is a modifiable risk factor. Reducing salt intake can help manage and prevent hypertension.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl to remember is that while age is a non-modifiable risk factor for hypertension, early detection and management can significantly reduce the risk of complications. Regular blood pressure checks are essential, especially for individuals with a family history of hypertension or other cardiovascular risk factors.

## **Correct Answer:** C. Age