Table schema:
CREATE TABLE visitor (name VARCHAR, age VARCHAR, id VARCHAR); CREATE TABLE visit (visitor_id VARCHAR, num_of_ticket VARCHAR)

Question: Find the name and age of the visitor who bought the most tickets at once.
SQL: SELECT t1.name, t1.age FROM visitor AS t1 JOIN visit AS t2 ON t1.id = t2.visitor_id ORDER BY t2.num_of_ticket DESC LIMIT 1