I'm wondering if any-one here has had a cockatiel since tiny that learnt to talk. If so, can you please tell me how long it took before they started to repeat words?

Our male cockatiel is around 9 months old and lives indoors with us. We got him at 6 weeks old and we talk to him constantly. We even let him watch TV ...
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... (he's spoilt) and although he seems to be making lots of clicking type sounds, he's not actually making any noises yet that sound like words.

We chose a young male from advice I got here on NT, but are now starting to wonder if we're doing something wrong, or he's still too young, or else he has no desire to talk to us at all.
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I've repeated the same words and short phrases over and over ever since we got him, so could somebody please tell me if there's still any chance that he may talk, or has this been a fruitless exercise?