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Hi guys sorry for the slow reply have been dying with the flu.Well thanks sooooo much for your helpI'm not sure that 5 years is that great an age for a discus - I've always heard up to 10, nearer 8 is more realistic, so likely worth treating them rather than putting it down to age. I've had mine about a year now, so I can only go on what I've read /heard!
Hole-in-the-head can also be caused by hexamita, other symptoms are white stringy poop. and lack of appetite. It could be that - are there any other symptoms? If it is that, it's probably best to treat the whole tank rather than just the poorly one; however I would wait until you're sure as I think hex treatment can be a bit harsh on the fish.
I've also heard, like Liam, that errosion of the little pores on the head can be caused by using carbon in the filter (I don't understand this one myself, perhaps leaching of some mineral from the water by the carbon?) or diet. If there are no other symptoms and the fish seems perfectly happy, I'd prefer to remove the carbon (if you use it) keep a really good regime of water changes, and try to improve the diet as much as you can, as Liam suggested above. The cloudyness of the eyes would to me suggest it is more likely to be diet /environment.
Anyhow, good luck with them.