Kat, hi! I personally do not think there is a way to know if there would be a difference between working with a younger or an older bird simply because they are all individuals. One's approach to training/teaching and interacting with a bird of any age (or species) should, in my personal opinion, be the same: respect the bird's signals (body language), respect the bird's free will and right to choose (within safety limits of course), treat the bird with understanding, patience, love and empathy, apply what is called applied behaviour analysis in training, do not take personally any "no" coming from your bird ("no" is communication just as much as "yes" is), such as a refusal to interact with you at a given moment, or a rejection of an offered treat for example, and you will be able to develop a trusting relationship with any bird. It may take a shorter or a longer period of time for the bird to give you his/her complete trust, but birds are always a work in progress. We need to earn and keep their trust daily and try not to break it at all if possible, otherwise it is easily back to the drawing board. If I were in your shoes and were looking for a bird to add to my current flock, and also if I had access to a rescue, I would go for a bird that would choose me, preferably an older one. I do love younger birds (not necessarily babies), don't get me wrong, but I love the older guys who need a home just as much. With an older bird, chances are his/her personality, once in full bloom after having integrated into your flock, even if that flock is made of just you and your bird, will not change too much, which may not be the case with a younger bird, which will go through stronger hormonal changes throughout the years and the personality of which may change more dramatically at time goes by. Old or young, they all change, and so do we. I love the older guys (birds, I am talking birds here ). I also love those who need a bit of help in restoring their confidence and becoming a bird again (those who have, unfortunately, been through traumatic experiences). They were young once, too. Whichever way you choose to go - younger or older, rescue/rehome or not, enjoy seeing your bird's personality unfold before your eyes, and remember, they will change with age, more likely than not.