I am looking for a single word for "the number of times a value is copied".
My company makes software for plant breeders. Breeders do observations on plants and when they create a new generation of plants, e.g. by crossings, they copy observation values to this new generation. Of course, when this is done several times, the values become less reliable because of genetic changes. So we want to show a table with values and a column with this "number of times a value is copied" (to a new generation) as a short header.
I'd use a title like data age or data vintage. The latter usage would be analogous to vintage denoting the "year and vineyard or district of origin" of a wine.
Incidentally, it probably is inappropriate to say that "the values become less reliable because of genetic changes". The data does not become less reliable, it becomes less applicable to current generations.
Update: Phrase copy count is short and to the point. Also replications.
Perhaps I misinterpret what it is showing, but is it demonstrating how well a genetic trait survives pressures of environment and therefore survival of the fittest from one generation to the next? i.e. the more generations a value is copied down, the "fitter" that genetic trait is?