Glad to see more fellow users in this forum taking notice of such a fine site as The Patches Scrolls! 😎
It should be a like a bible for us DOSBox users that just love old DOS games.
Odds are that if a patch was ever released for a specific game, it's most likely available there.
As for how long they've been around, here's a quote straight from the source:
The Patches Scrolls website is THE source for game patches. Many times, especially if the game is an older game, the publisher has possible gone out of business, been bought out by another company, or just stopped supporting the game that you need a patch for. In this case, it can be VERY difficult to find the manufacturer's patches. The Patches Scrolls is updated daily with new patches and has been a repository for all your game patching needs for over 10 years. If there was ever a patch made for your game, it is very likely that we have it. If we don't, let us know and we will do our best to find it.