Shipping containers are made of corten steel, so they can withstand very demanding circustamces (wind, water, fire, ice, salt, sun) and rough handling. Initially, shipping containers are used in shipping for 5-14 years, and after that they are released for other use.
Containers that aren’t used for shipping are perfectly suitable for use as storage containers. Used containers can be used for storing usually for around 10 years, but by taking good care of it, it can last a whole lot longer. Things you can do to extend the container’s lifeline include painting it, patching holes, changing seals, fixing the floor and taking care of or changing twist locks.
New shipping containers are usually brought to Europe from China. In storage use, a new container can easily last up to 30 years! New containers don’t require special care in years.