You can only tell by by the band [if he has one] ask your vet what the numbers mean . Im going to take a guess because of the amount of blue. Maybe younger. Pm Henpeckcked maybe he can take a stab at this.
here he is at about 11 months
so you can see the difference, in the fist pic you can see how his body hasn't filled in yet, but the second pic he is looking a little more proportional, and by the last pic he is filled in nicely
in this last one you can see his eye color at about 11 months not anywhere near as dark
hope this helps, but as the others have said unless you know the age it is very hard to tell
Jake YNA 1970,Kia Panama amazon1975, both i removed from nest and left siblings, Forever Home to,Stacie (YN hen),Mickie (RLA male),Blinkie (YNA hen),Kong (Panama hen),Rescue Zons;Nitro,Echo,Rocky,Rub
I agree with hen, but I also have to state that sometimes birds eyes do not change my blue throat is nine years old and still has dark macaw eyes... So there are times when they do not change and it can be deceiving at times.