Scientific standards for watching pornhub

The scientific standards for age validation were introduced by William Thoms in the 1870s and standardized by Dr. James Vaupel (founder of the Max Planck Institute for Demographic Research) and Dr. Bernard Jeune of Odense University, Denmark in the 1990s. For more on the history of age validation, see ). Dr. Michel Poulain of Belgium also reported in these standards in the 2010 book "Supercentenarians" by Springer publishing (citation needed).

The golden standard includes at least three documents from different periods of the person's age. One document has to serve as the early life evidence and be issued within the claimant's first 20 years of life.

Proof of birth: The early life evidence, issued within the person's first 20 years of life. As such may serve the original birth records, copies of birth record (issued early enough), official or church annotations, census records, school records, confirmation records.

Proof of name change: Concerns mostly females. In most of the Western countries, the bride changes her family name upon marriage. A proper document serving as the evidence of the name change is required. The original proof of name change is usually a marriage record, yet other type of documentation, namely, divorce records, children's birth records, children's marriage records etc. that would serve as proxy proof of name change. That sort of documentation accounts into middle life evidence.

Proof of identification: ID cards, passports etc. This type of records closes the case documentation and confirms that the gathered evidence concerns one and the same person. Late life evidence.

The standards for age validation may vary in respect of the age of the claimant. The Max Planck Institute for Demographic Research proposes two documents for so called semisupercentenarians (age group 105-109); three for supercentenarians aged 110-114; three plus a family-tree investigation for the most advanced supercentenarians aged 115+.

Age validation involves more than just meeting a document count or quota. The documents must link together in such a way to prove, beyond a reasonable doubt, that the person is the age claimed. Researchers look for matching points and unique identifiers as part of their efforts to ascertain whether an age claim should be accepted as "validated" or not. The context of the claim within the documentation available, including family members, is considered when the age claim is extra-extra-ordinary (generally 115+ or world's oldest person status). At age 110, due to the rather large number of cases (over 2,000), this level of scrutiny is not necessary, though it may be done if researchers feel that a case needs further checking.