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2. Age disparity in sexual relationships - Wikipedia

   en.wikipedia.org/wiki/Age_disparity_in_sexual...

   In sexual relationships, concepts of age disparity, including what defines an age disparity, have developed over time and vary among societies. Differences in age preferences for mates can stem from partner availability, gender roles, and evolutionary mating strategies, and age preferences in sexual partners may vary cross-culturally. There are also social theories for age differences in ...

3. K–Ar dating - Wikipedia

   en.wikipedia.org/wiki/K–Ar_dating

   Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar). Potassium is a common element found in many materials, such as feldspars, micas, clay minerals, tephra, and ...

4. Radiocarbon dating - Wikipedia

   en.wikipedia.org/wiki/Radiocarbon_dating

   Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon .

5. Absolute dating - Wikipedia

   en.wikipedia.org/wiki/Absolute_dating

   Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy. [1] [2] Absolute dating provides a numerical age or range, in contrast with relative dating ...

6. Marriage age in the United States - Wikipedia

   en.wikipedia.org/wiki/Marriage_age_in_the_United...

   In the United States, the minimum age at which a person can marry in the United States as a right, or with parental consent or other authorization. This age is set by each state and territory, either by statute or where the common law applies. The general marriage age (lacking authorization for an exception) is 18 years of age in all states ...

7. Dendrochronology - Wikipedia

   en.wikipedia.org/wiki/Dendrochronology

   Dendrochronology is useful for determining the precise age of samples, especially those that are too recent for radiocarbon dating, which always produces a range rather than an exact date. However, for a precise date of the death of the tree a full sample to the edge is needed, which most trimmed timber will not provide.