Yes, you must be at least 6 years old, so children under age cannot enter.
Entry to 516 Arouca requires the purchase tickets. Buy your tickets now to guarantee your visit. Tickets are limited and they are not sold at the entrance of the bridge. The ticket for 516 Arouca also includes the visit to Passadiços do Paiva, as long as the visit takes place in the same day. Between May and September (inclusive), if you choose the visit time to the bridge from 6:30 pm, and if you want to make the Walkways, it is compulsory to visit them before visiting the bridge.
Yes, you must be at least 6 years old, so children under age cannot enter.