For the record, this list was originally intended to be a mere sidebar, thus the short (for me, anyway) length and the limit of only five games. Myth:TFL (to give just one example) would have made the list for sure if it were longer.
As for why the games are all "old," there are two obvious reasons. One is that "best ever" lists always tend to skew old. Just look at the AFI's
top 100 movies list, for example. The average movie year is 1959. The other reason is explained in the first two sentences of the article, where I define the terms of the list: "A 'Mac game' is a game that?s some combination of first, best, or only on the Mac. Such games are rare these days." Had I decided to define a "Mac game" as simply "a game that runs natively in Mac OS or Mac OS X" then the list would have looked very different and would have included many newer games.