How to Calculate age between two dates

I do know there are many Javascripts available to calculate age based on current date, But I want to calculate age between two user given dates
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For example, a user must be able to choose the Start date,day & year from a dropdown menu.Similarly the user must also be able to choose the End date,day & year.
-----On clicking Calculate ,the result between the dates should be displayed as age in years & months (like 24 yrs 6 months)
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Can anyone give me the code to set this up?

 

Check out datejs and learn to use that library. I can help you with code for a low price. PM me if you want my assistance.

 

Im not professional in writing javascripts.So dont know much about libraries & other stuff

 

The code below works, just change the dates to suit your calculation.

<script type="text/javascript">

//Set the two dates
today=new Date()
var christmas=new Date(today.getFullYear(), 11, 25) //Month is 0-11 in JavaScript
if (today.getMonth()==11 && today.getDate()>25) //if Christmas has passed already
christmas.setFullYear(christmas.getFullYear()+1) //calculate next year's Christmas
//Set 1 day in milliseconds
var one_day=1000*60*60*24

//Calculate difference btw the two dates, and convert to days
document.write(Math.ceil((christmas.getTime()-today.getTime())/(one_day))+
" days left until Christmas!")

</script>