I have only had mine a few months but it has become one of my favorites. I have 4 other birkins, either in togo or fjord, and I am loving the lighter weight and how it is nice and structured. Also the color saturation is just beautiful.
If you could please have a look at the reference section? Tons of photos of Epsom bags of varying ages, sizes, etc. And many other threads on this leather, including this recent one on how this leather ages - thanks!