Calculate Age from Date of Birth using Apex in Salesforce

Apex Class:

public class CalculateAge
{  
    public Integer age {get; set;}    
    public Date dt {get; set;}
    
    public void FindAge()
    {
        Integer days = dt.daysBetween(Date.Today());
        age = Integer.valueOf(days/365);
    }
}

Visualforce Page:

<apex:page doctype="html-5.0" controller="CalculateAge">
    <apex:form>
        <apex:pageblock title="Calculate Age From Date of Birth">
            <apex:pageblocksection>
                <apex:pageblocksectionitem>Date of Birth:
                    <apex:inputtext onfocus="DatePicker.pickDate(true, this , false);" value="{!dt}"></apex:inputtext></apex:pageblocksectionitem>
                    <apex:commandbutton value="Get Age" action="{!FindAge}"></apex:commandbutton>
                    <apex:pageblocksectionitem>Age:           
                    <apex:outputtext value="{!age}"></apex:outputtext>
                </apex:pageblocksectionitem>           
            </apex:pageblocksection>
        </apex:pageblock>
    </apex:form>   
</apex:page>

Output:

download

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