Its certainly a rarity. Statistically speaking, with 365 days in a year, theres a . 27 percent chance of any two people sharing the same calendar date as birthdays. And those odds mean that its possible – improbable but not impossible – for those two people to have a connection and marry.

What are the odds of a couple having the same birthday?

One person has a 1/365 chance of meeting someone with the same birthday. Two people have a 1/183 chance of meeting someone with the same birthday. But! Those two people might also have the same birthday, right, so you have to add odds of 1/365 for that.

What do you call someone with same birthday?

Apparently astrologers have a term for this, date-twins. If the details are precisely the same then they call them astro-twins.

What do you call siblings with the same birthday?

When people refer to Irish twins, its important to recognize that although the siblings are close in age, they are not actually twins. In other words, they were not born during the same gestational period. Calling them Irish twins is just an informal way of classifying siblings that are born close together.