Cameras handled and stored properly will last many years.
Proper storage, and considerations such as how humidity affects your cameras and accessories is an essential part of assuring that your valuable equipment will last for many years.
The Facts
Relative humidity is generally described as the amount of water vapor present in a given air temperature and can cause problems when storing your camera. High humidity can bring on the growth of fungus that attaches itself to moving camera parts, and if it gets on lens elements and coatings it may cause unwanted spots in your photographs.
Manufacturers routinely use special oils to keep mechanisms in cameras working smoothly, so in the case of low humidity, these parts may tend to dry up and cause excessive wear.
Prevention/Solution
Your camera, like other mechanical devices, likes to be used. Operating its functions, especially outside on a warm day, keeps it in good working order and greatly reduces the chance of moisture getting inside.
A good rule for storing your camera would be in a place where you yourself feel comfortable. For example, in a camera bag that's placed in a closet of a room temperature home, over a dark cold basement.
Hygrometers
Hygrometers are devices that can be used to more precisely evaluate the relative humidity where you store your equipment. You can purchase one for as low as $6 for analog; expect to pay more for digital depending on the model.
Long-Term Storage
Saving your original packaging helps protect the value of your camera equipment.
If you plan on not using your camera for an extended period of time, storing it in the original packaging with the battery removed is your best bet. Cartons lined with support inserts and the silica gels that reduce moisture keep your equipment well protected. By doing so, you've increased your resale value too.
Tags: your camera, last many, last many years, many years, original packaging