As foor wood paper it's not as much that there's acid used in the making, as it is that there's lignin naturally in the wood. And this oxidizes, yellowing and brittling the paper.
So to get durable paper one has to actively remove the lignin (creating "acid-free" paper), but this seems to have become commonplace in the 1950:s at the earliest.
(Before that one would still use non-wood paper for things intended to pass the test of time.)