Write SQL query to solve given problem: How many athletes over the age of 59 competed in the 2016 Summer Olympics?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T2.person_id) FROM games AS T1 INNER JOIN games_competitor AS T2 ON T1.id = T2.games_id WHERE T1.games_name = '2016 Summer' AND T2.age > 59