We've had our bonded pair for a year now, and based on the info given to us by the prior owners, the male would be about 3 or 4 years old. He came to us knowing how to whistle what we call the 'pretty bird song', and happily sings it to me when prompted. I'm wondering if he would be capable of learning to whistle a new tune, given his age. There are cockatiel whistle training videos on YouTube, and I thought I could play one for him on repeat. But...there's no point driving everyone else in the house nuts if it's a lost cause! Obviously every bird is different, but I'd love to hear if anyone else has successfully taught an older bird a new tune. Thanks!