mysql> create table TrueFalseTable
   -> (
   -> Adult boolean default false
   -> );
Query OK, 0 rows affected (0.65 sec)

mysql> insert into TrueFalseTable values();
Query OK, 1 row affected (0.16 sec)

mysql> select *from TrueFalseTable;

+-------+
| Adult |
+-------+
|     0 |
+-------+
1 row in set (0.00 sec)