as I've seen differences between newer and older "luminova" dials - after the same charging time/condition... But then I have been told that the material [(Super)Luminova] does not suffer any practical aging. Maybe the material itself does not "age" per se, but been applied on a dial for a longer period do expose it to more air/moisture perhaps?
This is something I always wondered. From what I saw on my watches, I didn't see any luminous variations through year passing. But I noticed some luminous variations between two different Luminova.
I was surprised by the Milgauss as that was manufactured in 2007. I can read the time in the middle of the night. Datejust, Explorer and GMT have similar strength. Tudor BB is too new to go through real life tests.