For making gnocchi, it is generally recommended to use starchy potatoes rather than waxy ones. Therefore, aged potatoes are preferred over new potatoes. Starchy potatoes, such as Russet or Idaho potatoes, have a higher starch content, which helps in creating a light and fluffy texture for the gnocchi. New potatoes, on the other hand, have a higher moisture content and a lower starch content, which can result in a denser and stickier gnocchi. While it is not impossible to make gnocchi with new potatoes, the texture may not be as desirable. So, if you have the choice, opt for aged potatoes when making gnocchi to achieve the best results. They will provide the desired fluffy and light texture that pairs well with various sauces.