An article in News in Science on the possible genetic component in perfect pitch has a bit of interesting information about age and the perception of pitch:
"As people get older, their perception goes sharp. If a note C is
played, and they're 15, they will say it's a C. But if they're 50, they
might say it's a C sharp."
"This can be very disconcerting for them," Gitschier says.
The most commonly misidentified note, based on the study, is a G sharp.
That
may be because G sharp is overshadowed by A, its neighbour on the
scale, they say. A is often used by orchestras in the West as a tuning
reference.