Get age from birthdate using php the easiest way

Once i had a situation to get age of a user from his/her birthdate. After some testing, i managed to work it out. Following
code is used to get age from date. I hope this might help someone like me.

     //date in mm/dd/yyyy format; or it can be in other formats as well
     $birthDate = "08/14/1972";
     //explode the date to get month, day and year
     $birthDate = explode("/", $birthDate);
     //get age from date or birthdate
     $age = (date("md", date("U", mktime(0, 0, 0, $birthDate[1], $birthDate[0], $birthDate[2]))) > date("md") ? ((date("Y")-$birthDate[2])):(date("Y")-$birthDate[2] - 1));
     echo "Age is:".$age;
?>