I've only met a few people with perfect pitch and they weren't trained specifically to have it, it just developed naturally without any conscious pursuit.

Some people claim that perfect pitch can be taught. You probably could learn it, but it would take such a huge amount of time and work (compared to somebody "born" with it) that it wouldn't be worth it.

Some questions...

Musicians in places where they use non-western 'scales', what kind of perfect pitch do they get?

Do people with p.p. hear a well-tempered scale? Pythagorean? 'Just' intonation?

Ever run into somebody who associates pitches or tonalities with colors? (It's pretty cool...) Many of these people share perceptions, e.g. key of "D" sounds light blue.

Sorry about the tangent, hopefully a musician's input provides food for thought...