Write SQL query to solve given problem: How many users from the group "F29-32" who were active in the events on 2016/5/7?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T1.app_id) FROM app_events AS T1 INNER JOIN events AS T2 ON T1.event_id = T2.event_id INNER JOIN gender_age AS T3 ON T2.event_id = T3.device_id WHERE SUBSTR(T2.`timestamp`, 1, 10) = '2016-05-07' AND T1.is_active = '1' AND T3.`group` = 'F29-32'