Who is the winemaker? A quick WS search brought up one 2002 Chablis Valmur - Christian Moreau. WS gave it a 91, and ended with the comment: "Give it time, best from 2006 through 2012." This is from a 2004 tasting, at release I assume. In my experience, WS undrestimates when most wines will be at their peak, so it would be good until at least 2015.
I suspect it will be bright with more fruit now, but in 3 to 5 years it will show more complexity and more balance. In 10 years, it will be different again, but whether you would like it depends on if you like a little oxidation in your whites.
Try an old white sometime to see. This happens in about 5-6 years with a California Chard, after 10 years or more with a white burgundy.
And I do not think that some Rieslings, particularly German, but also Alsatian and Austrian, ever reach their peak - they just keep going.
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Feeling (south) loopy