It's probably possible to tell that ink was applied to paper recently, even if the ink and paper are both old, but I'd expect that the longer it has been the more uncertainty there is so you should be able to fake an N year old document without having to let the ink dry or set or diffuse or whatever it does for N years. I'd assume that there are ways to speed this processes up, too.
I have no idea what the curve looks like though. This may only be practical if you aren't in a hurry. So, faking a document that you've just found out you need and you need soon might not be feasible, but faking something like a mint condition vintage comic book might be possible.
Probably should also use vintage staples or glue or whatever was used for binding at the time you want to claim the document is from.
This is really the kind of thing you want to plan ahead for, rather than find yourself on eBay trying to find a specific make or model 50 year old printer that works.
Any competently run evil organization that has a decent budget (Hydra, KAOS, Cobra, AIM, etc) will regularly buy copies of the document production equipment and supplies used by contemporary businesses, governments, and hero groups and keep that equipment working and well maintained for several decades for retroactive document production.
Confidence on this measurement is probably very low. Documents in a basement in Miami (they don't do basements in Florida for a reason) will age very differently to documents in an attic in Tuscon which will age very differently than documents in a garage in Fairbanks.
https://www.youtube.com/watch?v=VMDP3Iz6D6A
(although the pedantic in me notes that he used the wrong selectric ball (prestige elite vs large elite) for the license)
I wonder how much you could infer about a doc given its margins, font, kerning, leading, etc. "This looks like default settings in Word XP"