The age of an artifact as determined by a date printed on it or a reference to the artifact in a work of history.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc.
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'''Known age''' is the age of an artifact as determined by a date printed on it or a reference to the artifact in a work of [[history]].<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc.