Mark pulling a fast one, getting you in a link loop.

I believe he meant this thread:
http://www.therpf.com/f9/weathering-lukes-grail-diary-214128/
I've used several different methods, most work to varying degrees, all require experimentation to determine amounts, time, and paper type.
IMO, if at all possible, use a laser printer, it allows for much greater verstility in aging (except heat, which can reactivate the toner and cause pages to stick together if they're hot enough).
If you soak your pages, hang them up to dry, over a rack or rod with them hanging basically folded over the rod. If they are allowed to dry on a flat surface the edges dry first and puts in waves that are hard to get out. Hanging allows them to dry from the center of the page out and the weight of the wet edges helps pull them into a more flat piece. I let mine completely dry, then place a slight damp paper towlel between some of the sheets ( maybe 5 paper towels amongst 300 sheets, so not much) and put them in a press. This puts a lot of pressure on them and they come out completely flat. Putting them under some books isn't suffcient, you needs strong boards and a threaded type clamp. The flatness actually makes it look too new, so they need a bit more work to get the new appearance gone, but you won't have the giant waves which look really fake.
As for materials to stain with, cofee provides a good base. You can randomly sprinkle instant coffe and regular ground cofee on wet paper to add spots and variation.
The steel wool/vinegar solution is good, but takes patience. Also, the steel wool doesn't have to completely dissolve, 24 hours and the steel wool can be removed, strain the solution to get rid of any chunks. The solution has a chemical reaction with the tannins and like many chemical reactions, it isn't instant. Spray a little and give it time to work. The first time I used it, I didn't see an instant change, so I soaked the page. When it was finished it was almost so dark you couldn't see anything, lol.
Something else is walnut stain. I skipped the crystals and just gathered some walnuts, soaked them for 24 hours and had another stain option. It provides a more brown vs the yellowish brown of coffee.
The link at the top of the page is really good tutorial by Mars. I recenty tried it and like the results. If you go a bit too heavy with it, sand it some, removes some and gives a more worn feel to the page, even better.