Great care for your items will help them last for generations.  For all display pieces and furniture, a regular dusting will improve their longevity.  Periodically, a light reapplication of a high quality automotive wax to all high gloss items may be required.  
For all other display items a reapplication of a good quality paste wax can be used (clear Briwax and Myland’s clear beeswax are good choices).  For all utility items, regular use for serving food is expected and encouraged.  After use, wash by hand with a mild soap and water, then let it air dry.  Do not soak your utility pieces in water, and do not place them in a dishwasher or microwave.
With use and age, an occasional reconditioning of your bowls, plates, serving pieces, etc. with walnut, olive, or mineral oil will help bring back the luster.