Those under 18 years and over 65 are often entitled to free or discounted admission to state-run museums and cultural sights. To claim your discount take proof of your age, ideally an ID card or passport.
International Student Identity Card (ISIC; www.isic.org) entitles students to various shopping, accommodation and museum discounts in Cagliari, Sassari and Nuoro. A similar card is available to non-students under 26 years, the International Youth Travel Card. The cost varies depending on where you get it, but reckon on about €15.
European Youth Card (www.euro26.org) offers a wide range of discounts across Europe. Cardholders do not need to be European citizens. It costs €11 if bought in Italy.
Student cards are issued by student unions, hostelling organisations and some youth travel agencies. In Cagliari, Sassari and Nuoro, the Centro Turistico Studentesco e Giovanile (www.cts.it) youth travel agency can issue ISIC and IYTC cards and the European Youth Card.