I know that many parts of Europe nudity is allowed in spas, on beaches, or in parks. In Germany bathing suits are banned in the spas (I understand they are considered unsanitary) -- at least the ones I have visited. I also saw that people of all ages were in the spas, from young children to elders.
What is the proper etiquette in the spas in Hungary? Are bathing suits required, optional, or banned? If nudity is allowed, are there age limits?