text: what are the chances of meeting a person born on the same day/year on a random point of the globe?   it depends on the persons situation.  if the person is at school or any other situation where they are with people of the same age, the odds of anyone you meet sharing birthdate is 1/365.  therefore - in a class of 36 on their first meeting (ie. start of school) roughly there's a 10% chance of meeting someone with the same birthdate.  in general - someone you meet is going to be between 1-80 years old and born on 1/365.25 (incorporating leap-years) days.  so say roughly 1/30000.  obviously - if you go to an area with a high number of retired people whilst you are young - the odds are drastically reduced - and vice versa.