Nytoprod has a couple of older ones (look at my gallery for Duval). they are quite good. There is Grandmaster  on Daz I think. Not many though. You can also try using a bump map from one of the older guys with one of your favorite other textures (also some displacement if you want). That isn't perfect but it helps age them a bit.

I've been looking for a photoshop bruch that can help make aged textures for models but haven't found anything that relaly works yet. Cracks don't look write nor do spider webs. I'll let you know if I find anything.