Twenty-four years young. XD
Somehow, Vi’s former owners taught her to say ‘Goodbye!’ or ‘Buh-bye!’ and shake her head whenever you wave at her.
I suspect the way they did this was, whenever she said ‘Buh-Bye!’ they would wave at her, then rewarded her with LOTS of verbal praise, maybe some head-scritches, and possibly some treats. In this way, they trained her to associate them waving with the phrase ‘Buh-Bye!’
Here is the result: