instead of using Notebook (old), why dont implement Notebook (used)?
because sometimes, forumer juz use the laptop for like few months and selling it away and the old dont really seems approriate.. juz my suggestion though

Maybe have both? Old as in P3 and below, while Used as in P4 models? Actually quite hard to define Old and Used, but it's a good idea nevertheless.

Fair enough. I've changed it to 'used'. And added an 'antique' category for really old stuff.