Well look, I'll go double check on this then but I could have sworn they were fully moving into NAS style and the aged stock was running out. I haven't seen any aged versions around here or any duty free I've been to (3-5 of them in the past year around the world) so it was my understanding the supply was going very fast and all the years were being replaced by that color scheme version (amber, green, red etc). I don't know if those stores have backstock or it's still coming but I haven't seen aged Mac in quite a while. I did read an article oh probably 6 months ago about it and Mac said that they were in favor of it (eh who knows) becuase everyone gets so wrapped up in the exact year/age of a scotch when really it's only an indicator and there's stuff that's junk at 25-30 years and it's novelty and then things like QC that are only actually about 6-7 years and in the end as long as it's a good product and you trust the brand and blender, then who cares what exact number of 'years' it aged for. It's like picking a suit based on a brand name and chest size, really doesn't tell you anything you actually need to know about how it'll fit you. I only have a Mac 12 myself, would like to add the 18 and was bummed I missed out on that CS version a couple of years 'back.
For me, it's about full disclosure. Like that tag on an article of clothing indicating the fabric composition. It might not be an important element for everyone to know, but it's important information to those in search of quality. It has not been an issue for distilleries in the past to clearly mark the age on their bottlings. Sure it has a lot to do with the whiskey shortage world wide, but it suggests that they are aware of the marketing misstep of being transparent with these NAS bottlings.
I would not care if a good dram just happen to be 6 or even 3 years old, but have the courage to present this information on the bottle. It's something we would demand on our other sartorial endeavors, why not here?