Gold plating is delicate by nature, and does wear over time. To keep your item looking fresh for as long as possible, keep it away from all kinds of moisture - perspiration, humid air, etc, as well as chemicals such as soap, perfume, skin care products. This applies to both wearing the item, and storing it. A silica pouch in the jewellery box can be a great help.
Far into the future, if you do find that your gold is worn, it can be replated affordably.
