Auto Populate Date of birth by age In Lightning Component

.cmp file

<aura:component access="global" >
    <aura:attribute name="dateOfBirth" type="Date"/>
    <aura:attribute name="age" type="Integer"/>
    <lightning:input type="Date" 
                     label="Date Of Birth"
                     required="true"
                     value="{!v.dateOfBirth}"/>
    <lightning:input name="text" label="Age" 
                     onkeyup="{!c.calculateDOB }"
                     value="{!v.age}"
                     format="MM/dd/yyyy"/>
</aura:component>

controller.js

({
    calculateDOB : function(component, event, helper) {
        var ageNo = component.get("v.age");
        var today = new Date();
        var dd = today.getDate();
        var mm = today.getMonth(); //January is 0!
        var yyyy = today.getFullYear();
        var dob=new Date(yyyy-ageNo,mm,dd);
        component.set("v.dateOfBirth",dob);
        console.log(dob);
    }
})