Travellers aged 12 to 17 can enter Spain as long as they provide a negative PCR test result. Vaccination certificates are only valid for 270 days after the last dose. You must show proof of a booster shot if your most recent shot exceeds that period and complete a health control form 48 hours before travelling. A COVID-19 recovery certificate is valid between 11 to 180 days of diagnosis. Lastly, wearing masks and practising social distancing are mandatory, especially in public places.