How can I tell my new budgie's age if I bought it from a pet store?

Based on the cap and eye color, probably at least 4-8 months. Usually the band color will tell you what year the budgie hatched if they are registered with the American Budgeriger Society. Since he was obtained in Australia, he is probably registered there. . Checkout the info on the website though at https://abs1.org/ to see if you can find any links to Australian societies.

If they are at least 12 months of age, you can determine gender by looking at the color of the cere (nose). In males, the cere is a blue color. In females, it is tan/brown. If they are younger, you will need to wait or you can have them sexed by DNA using blood or feather samples.

Penny looks like a female. If she has a closed band on one of her legs, her hatch date and the breeder's initials may be imprinted on it. If not, it can be very difficult to determine age. You can get an approximate age by looking at her eyes. If they are completely black, she is 4 months of age or younger, if there is a faint ring in her iris then she is between 6-8 months. A distinct white iris ring puts her at 8 months or older. Clipping wings, when done properly, is safe and does not hurt the bird. Only the primary feather should be clipped. If you have never clipped wings, allow your veterinarian or an experienced avian vet to clip them first. Clipped wings are replaced with new ones when a bird molts.

The color of the cere (the area just above the beak) is essential to understand the gender but unfortunately before 8months old is very difficult to visually distinguish males and females. Please repost your question in few months so we can help you assessing sex. Generally speaking I would recommend to have a look at this website for anything concerning your budgies. http://www.beautyofbirds.com/

Ocean is too young yet to be visually sexed. You will need to wait until he or she is at least 12 months old. There are still bars (stripes) on the top of the head and the iris ring is very faint. It will take at lest 6 more months, maybe 8, before you can determine sex visually. You have the option of having a DNA sex test done. Your vet can submit feather and/or blood samples for this test.

Knowing an exact age in an adult bird is very difficult. You can look at the ring around his neck as males that are mature (around 2 years) will have a bold ring, while females will have a greener one. Older birds will also have brighter plumage and may have scalier feet. Beak color will also darken as a bird ages. You can most certainly try to teach some words just by spending time together, talking to Benzo, and offering him a treat whenever he shows interest in talking or attempts to communicate with you.

The barring on the head may be decreased, but depending on your bird's genetics and coloration, they can still have barring on the top and back of the neck- however with each molt as they reach sexual maturity, you may see fewer bars on the top of the head or near the nose and beak. This is normal! You may also not see a full-blown molt in some birds as they will be growing in new feathers at the same time they lose the old, so it is very possible Kiwi has molted and you just didn't notice.