//Calculate someone's age based on a date of birth string
$year = date("Y"); // Get this year as a string, date(string format, [timestamp default: now])
$dobtime = strtotime("04/09/1980"); // Get date of birth as a timestamp
$age = $year - date("Y",$dobtime); // Take advantage of auto conversion to subtract this year from the year of the DOB
$bday = date("m/d/",$dobtime).$year; // Create a timestamp from their month and day of birth combined with this year
if((time()-strtotime($bday))<0) $age = $age - 1; // Compare their bday for this year to current timestamp and subtract one from the year if their birthday has not occurred yet
