There are many places to perform free birthdate searches, including public records databases, court and other documents, according to LexisNexis. Searchable public records databases include KnowX, Accurint, TLO and Lexis.
There is no central authority that maintains a database containing the birth date of every person. Sometimes finding a person's birth date may be as simple as performing a search on Facebook or Google, both of which have very large databases that contain birthdates of many people. For deceased people or for people whose information is not stored online, individuals can search court documents and public records, such as news articles, death notices and birth certificates. Such documents are often stored in different locations and may necessitate several database searches.