Old blackcurrants

Food does slowly go downhill in the freezer.  I would be wary of meat or fish that was that old, but I think fruit will be fine.  Have a look at the use by dates on frozen fruit and veg at the supermarket.   Its often well over a year away.

Why not defrost a few and see if they smell and taste OK.  If the texture has suffered a bit, they could always be used for jam or jelly 

Just used 2013 rhubarb with no ill effects 😀😀😀

I have just used 6lb of redcurrants from the freezer to make jelly.  I would say that some of them are probably 4 to 5 years old (and some have obviously defrosted a bit at some stage).   I only have one redcurrant bush so I just chuck the fruit in the freezer each year.  I have just bought a jelly bag and stand, which prompted me to defrost and use them - and, if I do say so myself, the jelly has turned out a treat!