Cast dental gold and gold foil have been proven to last longer than any other dental material if it is properly done.
Restorations can last a lifetime if properly done and maintained. There is a higher level of skill required to perform gold restorations compared to other dental materials.
However, there are study clubs and academies that teach the proper use of gold restorations to dentists who wish to pursue excellence with golds. The American Academy of Gold Foil Operators and the Academy of R V Tucker Cast Gold Study Cubs are examples of these resources for dentists.