Buy Puzzles for five and six year old's to stimulate their cognition, problem solving abilities, memory and concentration. Puzzles are a great and engaging screen free activity for children and 5 and 6 is the perfect age for puzzle play. In general, ages five and six is suitable for puzzles with pieces ranging from 50 to 100 pieces, depending on ability of course. Some children that are this age can tackle more challenging puzzles, depending on their skill set.