Pure malt simply means there is nothing other than 'malt' in the distill, some use maize (Bourbon), wheat and other 'additives' LOL and unlike Red wine how long whisky's been bottled means squat, its years in the cask that counts
The malt is usually barley in a single malt.
And whiskey/whisky originated in Ireland, not Scotland
Glenfiddich is GOOD stuff, another good everyday 'on the rocks' whisky is (yes its a cliche I know) is Chivas but I prefer Dimple, a little smoother (again this is as subjective as speaker/cable choice). Makro surprisingly have a very good range as do Ultra liquors (if you have them outside of KZN)
Gert we need to sit one day and discuss LOL sorry did I say discuss? meant drink