## 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 include age, family history, and genetic predispositions. Understanding these risk factors is crucial for early detection 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 arteries naturally become less flexible, which can lead to increased blood pressure. This process is inevitable and cannot be altered by lifestyle changes or medical treatment, making age a non-modifiable risk factor.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is not provided, but typically, any modifiable risk factor such as diet, physical activity level, or smoking status would be incorrect in this context.
* **Option B:** Similarly, this option is not provided, but if it represented a modifiable risk factor like obesity or sodium intake, it would be incorrect because these can be changed through lifestyle interventions.
* **Option D:** Without the specific content of Option D, it's assumed that if it represented a modifiable risk factor, it would be incorrect for the same reasons as Options A and B.

## Clinical Pearl / High-Yield Fact
A key point to remember is that while age is a non-modifiable risk factor for hypertension, regular blood pressure checks and a healthy lifestyle can help mitigate the risk of developing hypertension as one ages. Early detection and management are critical for preventing complications.

## Correct Answer: C. Age