Passage: Born in Linz, Austria, to Bosnian Croat parents who had moved there from Kotor Varoš in Bosnia and Herzegovina, Kovačić began playing at an early age at the local LASK Linz's academy. In 2007, when Kovačić was 13, he was spotted by scouts from several prominent European clubs, including Ajax, Inter Milan, Juventus and Bayern Munich, but his family opted to move to Zagreb instead, where he joined the academy of Croatian giants Dinamo Zagreb.

Question: How old was Kovacic when he was first noticed by many prominent scouts?
13