Indeed; I just didn't want to get into the whole debate about whether the replacement of the Whigs with the GOP as the other dominant party was a meaningful change or not. But it's safe to argue that the present system, including the specific parties in question, has been around for >160 years now.
Really, since America had a meaningful national government with the Constitution rather than being a loose federation of states under the AoC.
The Federalists and Democratic-Republicans both were establisged, as was their duopoly, by 1792.