My Bowie, a Yellow-Sided Green Cheek, just turned 2 years old, and he's been talking since he was around 6 months old...he is a DNA tested male, which does make a difference, as males tend to be much more vocal than females do...Bowie says a ton of words and phrases, like "You're my Baby", "Cheeky Cheeky Rasta Bird", "Gimme Kisses", etc. And I didn't teach him a thing, lol...Well, not purposely, anyway. I never expected Bowie to talk, and certainly not as much as he does or as well as he does...So Bowie simply started talking one day and then just kept doing it, and he just mimics me, as I've never once done ANY training at all...His voice is really clear too, it's bizarre for a Green Cheek...He talks way more than my Quaker or my Senegal, not that Senegals are know for talking (Kane sounds like a little robot, while Bowie sounds like me)...
A lot of people will say that "Green Cheeks don't talk", which obviously is not at all true, I should make a video of Bowie, because he's incredibly vocal, clear, and sounds just like me talking, in my voice...But it's true that Green Cheeks are not known for being "good" talkers, not like other species of Conures are...So there's no guarantee that you Green Cheek will learn to talk at all, just like with ANY species of parrot, even African Greys...In fact, there's a post in the Grey forum right now of a 3-year old, male Congo Grey who has yet to speak a word, he only makes sounds, and the OP wanted to know if that will change...most-likely not at his age, but you never know...So the bottom-line is that your Green Cheek may start talking, he may not, and if he's actually a she, then the chances become slimmer, but still not impossible...you just never know...
As I said, I never once did a bit of training with Bowie, and he started young. I got him at 12 weeks old and he started talking in phrases at 6 months, and gets better and better with time...But he did it just by listening to me...The other weird thing for a Green Cheek is that Bowie mimics my female Quaker parrot talking...It's really strange...My female Quaker talks a lot, as they do, but not nearly as clearly as Bowie does...Anyway, my Quaker mocks me all the time, telling me "No Bites" and "That hurts, ouch!" in her muffled Quaker voice...Well now Bowie is saying "No Bites, OUCH!" and "That hurts!" all the time, BUT IN MY QUAKER'S MUFFLED VOICE instead of his much-clearer voice...I never expected this from a Green Cheek Conure at all...So it just goes to show that you just never know, and there is no "RULE" about which species talk or talk well and which don't...