Please anyone help me about the shelf life of a reserve wine. If the reserve wine is from the year 2004 or 2005, is it still good enough to buy a few boteels and consume the sme ina years time?

Mostly its all going to depend on how the wine was stored over the years. So long as it was properly stored and no air has gotten to the wine then you should be OK. If possible and depending on the price I would do a tasting before committing to several bottles. Then you will have an idea of what your getting.