The life of a brochure will depend on the content and the material that has been used. The content might become obsolete in years, seasons, months, weeks or even days.
For example, a well established business' product catalog can have a life of several years, which is why a good quality paper and printing, which are durable, are fundamental.
On the other hand, a brochure that is promoting something for the next holiday will have a life of only a few days. The quality of the printing will pass to the second priority: the most important part will be the fast distribution of the brochure.