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Wikipedia uses several templates that self-update every day to keep date and age information current. These are very useful for a dynamic online encyclopedia and save users from having to regularly update that kind of information. However, when using this kind of template, a few things should be kept in mind.
Note: The template may not calculate the age correctly if a full date (month, day, year) is not provided. For example, a person who was born in 1941 could be either 83 or 84, depending on whether they have reached their birthday in the current year:
This template will return a living person's date of birth and age. Using this template rather than simply inserting the date into articles allows for the inclusion of hidden metadata about the date. This metadata can be used by web browsers and other software tools to extract the details, and display them using some other website or mapping tool, index, or search them. Template parameters ...
For a person whose date of birth is unknown, this template estimates the person's birth year and current age based on a given age at a certain date. This is useful when a reliable source states only their age at the time of publication.
that the present date is 30 January 2025. If the person was born after 30 January 1970 then they will be 54 years old on 30 January 2025 as they have not had their 55th birthday yet. On the other hand, if they were born exactly on or before 30 January 1970, then they will be 55 years old. Therefore, the template {{Birth year and age|1970}}
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The birthday paradox is the counterintuitive fact that only 23 people are needed for that probability to exceed 50%. The birthday paradox is a veridical paradox: it seems wrong at first glance but is, in fact, true. While it may seem surprising that only 23 individuals are required to reach a 50% probability of a shared birthday, this result is ...
that the present date is 13 February 2025. If the person was born after 13 February 1970 then they will be 54 years old on 13 February 2025 as they have not had their 55th birthday yet. On the other hand, if they were born exactly on or before 13 February 1970, then they will be 55 years old. Therefore, the template {{Birth year and age|1970}}