I think thats very true what Dan said Tyco is 6 yrs old and has an amazing vocabularty she nows colours and how to count what food are what like with red and yellow peppers she will say red peppers yum or yellow peppers she knows the different colours of them she also knows the different colours of the birds she say Fergie in green I have a Gray dress. she says many things and calls many thing by name she also likes to get her 2 cents worth in when my daughter and I are talking. she is 6 and still learning new things. I just taught her a new song and she picked it up within a couple of days you know the song that goes ooow eee ooow ahah bing bang walla walla walla bing bang. it was easy for her and we had a ton of fun with it. I don't think there is an age limit on new thing I think it up to us how big a vocabulary we want our birds to have they will learn as long as we are willing to teach.