I've played the piano for 50 years (I'm 55), and I do a lot of ear-training practice with software (Ear Master, etc) to keep myself sharp.
I still don't have perfect pitch. Without hearing a reference note, I won't get it.
In some ways, it's good. I keep my Bosendorfer tuned to A=443 and occasionally someone comes over whose used to the American A=440 and it bothers them. It doesn't bother me.
>In 1939, there was an international conference held in London that resulted in a recommendation to use A = 440 Hz, as a compromise between the various tuning systems used at the time, some of which reached beyond 450 Hz. This recommendation was further supported by the fact that the BBC required their orchestras to tune to 440 Hz instead of 439 Hz because 439 is a prime number, and the corresponding frequency was hard to generate electronically with standard electronic clocks. Eventually, in 1955, the standard A = 440 Hz was adopted by the International Organization for Standardization (ISO).*
* https://jakubmarian.com/the-432-hz-vs-440-hz-conspiracy-theo...
See https://en.wikipedia.org/wiki/Concert_pitch#Current_concert_...
A lot of continental Europe uses A=443 today