2000 ain't old. The polaroid 100D from 1991 I've been shooting is old. If it was frozen, there shouldn't be any issues you can't correct in printing. As far as reciprocity goes the times are the same. No improvements were made with velvia 50 that I'm aware of. You should be able to find a chart online quite easily. I pretty much shoot expired film exclusively and I wouldn't treat the film any differently. I also haven't won any awards.