The material of an item is an important piece of evidence for determining the production year of the item, such as if you see plastic, you can basically confirm that it is a product of the 20th century.
However, this method is not always accurate, especially for metals or alloys like copper, iron, or bronze, which have a long history of human use. It is difficult to determine their specific age just by looking at the material.
Of course, sometimes the proportions of trace elements in the ores from different mines vary, so it is possible to determine the origin of an item by a more detailed analysis and then determine its age based on the operating time of those mines.
However, this approach is quite limited, and it is hard to determine the origin of an item in situations where the mineral deposits have not been discovered, let alone determine its age.
