Can anyone tell me the age of my cockatiel by the information on his legband it says NZcs6650 i think?

The leg band number NZcs6650 typically indicates that your cockatiel was bred in New Zealand, but it doesn't provide specific information about its age. Breeder leg bands often include a year code, but it may not be present in this case. To determine your cockatiel's age, you could consult the breeder or check with a veterinarian who may help estimate the age based on physical characteristics.