How many years can offset printing paper books be kept?

The offset paper you mentioned is usually used to print the cover, and the quality is very good. Letting go for a hundred years is not a problem. In fact, ordinary paper products can be preserved for at least 100 years under indoor conditions as long as they are not particularly seriously affected with damp. There is a book that my great-grandfather read in my hometown. This is an old book with a thread. The paper is yellow and ancient, and it is ok now, but it is brittle and easily broken.