It all depends on what type of finish you are wanting to use... Acrylics can easily be aged by adding a few drops of "dirty" yellow pigment to the paint.
If you want to use Dingotone, it is much the same process... Ask DB nicely and he can age up the top coat slightly
If you are after that beautiful crackle effect as well, (on acrylic finish) it is a simple matter of attacking the finish coat with a xacto knife, basically drawing the crackle onto to the surface.. Then rub the approprite coloured stain into the cracks, clean up the excess and then apply one or two more coats of your tinted clear.
BTW, it is most probably the white base coats that have yellowed.... White poly is renowned for going yellow over time when exposed to UV light..
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