1 From the secondhand account, the reader gets more background information about what the Oregon Trail was. 2  From the firsthand account, the reader gets a better understanding why it was so dangerous.
Printers generally age more by the number of pages printed rather than by pure years. The rule of thumb has always been whatever the recommended volume is (for instance 5000 pages per month for a P3005) multiplied by say five or six years so about 300,000 pages would be the life expectancy of the printer.
The average shelf life of a standard printer cartridge ranges between 18-24 months after manufacture. This is true for brand new ink and toner cartridges made by the original manufacturer of the printer as well as remanufactured or compatible cartridges made by third party vendors. The amount of time a cartridge can be sufficiently stored is contingent upon some other factors beyond when it was manufactured.