Hi Wendy:
Here is a comment on wood aging that I seen done on a movie set at Upper Canada Village some years ago, they used a Lye solution applied with a brush on pine and it really did look quite old, you might experiment with it alittle because I dont know how it will act on other types of wood. Another trick they used was to spray on a weak solution of grey latex paint mixed with water, again alittle experimenting might help. these professional set dressers are pretty good at falsifying the age of wood.
NH