How old was Alexis Ajinca when he was first drafted?
age when drafted refers to Subtract(draftYear, year(birthDate)); first drafted refers to draftYear
SELECT draftYear - strftime('%Y', birthDate) FROM draft AS T1 INNER JOIN players AS T2 ON T1.playerID = T2.playerID WHERE T1.firstName = 'Alexis' AND T1.lastName = 'Ajinca' AND draftRound = 1