No Age Statement (NAS) Scotch Whiskies give you only one item of information you can rely on - they are at least 3 years old (otherwise they can not be called Whisky)
The 40% gives you no useful information - in the Warrior range you have:
- Svein - 40% - 40Euro
- Einar - 40% - 53Euro
- Harald - 40% - 75Euro
- Sigurd - 43% - 150Euro
- Ragnavald - 44.6% - 400Euro
- Thorfinn - 45.1% - 1000Euro
(Taken from somersetwhisky.com)
Those first 3 are all 40% alcohol but are very different blends from different casks.
There higher end of this range is likely to be older, and higher quality, and the Thorfinn has a specified 60% first fill cask (hence its colour and rich flavour) but they will each have whisky from casks of a variety of ages from 3 years and upwards, chosen in order to give the end product the required characteristics.
As with all whiskies - try the ones you can and go with the ones you like :-)