I know we've been through this topic umpteen times, but an idea came to me the other day. It has been suggested here, that perfect pitch comes from memory. That is, when we were young, we memorized, so to speak, the notes of the scale. Well, I think there's something else besides that. Why is it, with age, my perfect pitch is beginning to slide down. That is, if I whistle what I think is a c, it's slightly flat. almost a b. This never happened when I was younger. I could even name certain sounds - like a siren, or a bell. Now, when I do, I compensate for this and raise it almost a half step. So, I don't think it has to do with memory.
And I, too, don't think perfect pitch is such a great thing. Unless you're working in a music circus. And I love it that Martha Argerich doesn't have it.