PHP: How to get a Date when a person reach to a specific age? -

i working on task in dates involved. have person's age in months+days. want date when person reach specific age in months.

for example:

a person 250 months , 15 days old on 2010-1-25. on date person become 300 months old?  

function signature may be:

function getreqdate( $startdate, $curragemonths, $curragedays, $reqagemonths  ) {       //return date } 

since calculate current age birthdate, suggest use birthdate instead of current age calculate when user gets 300 months old. following equivalent of datetime solution given above (does not require 5.3):

echo date('r', strtotime('+300 months', strtotime('1990-10-13'))); 

with second param being birthdate timestamp above give

tue, 13 oct 2015 00:00:00 +0200 

further reading:

• http://us2.php.net/manual/en/function.strtotime.php
• http://www.rafaeldohms.com.br/2006/09/15/strtotime-is-it-useful/en/