Whether 66-year-old senior citizens and children under 1 meter tall need to buy tickets depends on the ticket purchase policy of the specific transportation mode. Under normal circumstances, the elderly can enjoy preferential policies, and children can ride for free if their height is below a certain standard (such as 1.2 meters). However, the specific situation may be different. It is recommended that you consult the customer service of the relevant transportation or check the specific regulations on its official website before purchasing a ticket.