er no. I just did a stock check and realised that a lot of my ingredients were out of date. One liquid yeast was out of date meaning its behavior would be unpredictable. That could mean anything from very long lag times, off flavours or just plain not working at all. Dry yeasts might last longer. Check best before dates.
If you have hops in the freezer they might be useable but the alpha acids will be much lower tan spec as they deteriorate over time, even under the best conditions.
As for the grains... they can absorb moisture over time allowing moulds and fungus to grow. Even though the boil will kill of micro organisms, they moulds and fungi will produce nasty flavours. The darker the grains the less of an issue this is while the lighter the grains are the more of a problem this becomes.
Mind you brewing is about experimentation so you could always try and see what happens. Worst case scenario you bring beer to secondary fermentation then throw beer down the drain is it tastes off. Mind you, perhaps you would prefer to look forward to a really good batch of beer. Which this sounds enticing to you is a matter for you.
