How to create Radio Button in Visualforce page in Salesforce?

Sample Code:

<apex:page >
<apex:form >
    <apex:pageBlock >
        <apex:pageBlockSection >
            <apex:pageBlockSectionItem >Name<apex:inputText /></apex:pageBlockSectionItem>
            <apex:pageBlockSectionItem >Age:
                <apex:selectRadio >
                    <apex:selectOption itemLabel="Male" itemValue="m"/>
                    <apex:selectOption itemLabel="Female" itemValue="f"/>           
                </apex:selectRadio>     
            </apex:pageBlockSectionItem>
        </apex:pageBlockSection>
        <apex:pageBlockButtons >
            <apex:commandButton value="Store"/>
        </apex:pageBlockButtons>
    </apex:pageBlock>
</apex:form>
</apex:page>

Output: