He is also quite a handsome boy! I think the fully developed iris ring means that he's closer to a year. How long have you had him? If you have other pictures of him you can go back and see when his eyes changed.
Oh, Amos is turned out to be quite the gentleman. I introduced him to Sugar for awhile today, and you would have thought that was the only other bird in nature. LOL Tonight he was preening her hair around her eyes. And Sugar was loving every minute of it. I have had Amos for 6 months. He is a real chatterbox. I have the two birds in a 60x36x28 inch cage and they have been flying all over the place. Amos is hand tamed but as my wife says we have taken the back seat for now...
I agree with the others that Mr Amos is older than 8 months. I would estimate him to be closer to a year and one-half.
It's great that Mr Amos and Sugar are getting along. I do hope you followed quarantine for Sugar before introducing the two.
Quarantine means housing the new bird in a different cage in a different room than the current bird (as far away from the room the current bird is in as possible) for a period of 35-45 days.
Budgies mask symptoms when they are ill. Symptoms may not show up for over two weeks.
Often you will not even realize your bird is not well. Many budgie illnesses are airborne which is why you need to quarantine your new bird in a completely different room.
It is also a good idea to always take a new budgie in to see an Avian Vet for a "well-birdie" check-up. This allows you to develop a good relationship with the vet and the vet can establish a baseline for your bird in case of any future illnesses or injuries.
As you have a mixed gender pair in the same cage, please be sure you follow the steps to discourage breeding.
Yes I did keep Sugar in another cage in my living room for almost a month. I sure did not want to take a chance on bringing a bug to Amos. Now they have been together for two weeks and they get along just fine. Should I add another couple of friends with these two to keep down the chances of them mating. Mother Nature is what I am worried about! What is the opinion on this matter?