Sometime i think if is better include in my blog old content (by enciclopedy and newspapers) or new contents (tech for example). i saw that old contents aren't optimized for google. the search engines prefers fresh and actual content. if u publish an article about news or last iphone, sure you will receive in first days many visitors. if u publish article about a book of 20 years old, you will receive.. 1 visit.
Good insight. Of course, content relating to news niche has a bubble life, people tend to surf through articles, in search of quick details. Articles about comparing Samsung S3 with iPhone 4 had until S4 and iPhone 5 had not hit our shelves. But, things don't change so quickly, for content relating to tutorials, tips, guide and etc. They have larger life span and can provide consistent traffic, even after years.