It's old, but I would open it, give it a smell and check the color. If smell is OK and color is not too bad, give the must a taste. You might be surprised. If it smells and tastes OK, I'd at least try to make it, even if the color is a little off.
Dugger, normally I would say this is a good idea but Sirs is unsure of the concentrate. Adding it to other wines could contaminate them if there is a latent problem with the concentrate.
I had an old one also... got it for a bargin. The juice smelled ok, and it turned out just fine. My kit recommended adding brandy. You may consider adding some Everclear along with the brandy. Yes, take all steps to prevent contamination!!!
Dugger, normally I would say this is a good idea but Sirs is unsure of the concentrate. Adding it to other wines could contaminate them if there is a latent problem with the concentrate.