It should be no surprise that the age of the oldest article in the report is increasing. Back when the first “dusty articles” report was run, the oldest article was about four years old; now, eight years later, the oldest article is twice that age, so that each year the oldest article reported is about six months further along than in the last. The processes for removing articles are not adequate to deal with the queue of articles that might be in need of updates. Of course, there is no guarantee that this linear aging will continue, and there have been short periods when the age of the oldest article did decrease, but never more than a few months.
All in all, the report provides a picture of the future of the lower end of Wikipedia, particularly as editing declines. Eventually, one has to think, the report will almost cease to change, as the few reasons people find to make minor updates to these articles will come up more and more rarely.
You mean, Wiki ISN'T magic and eternal??? ooohhhh!!! You bad bad boy!!! Bend over and let James Forrester spank you with a slab of seal blubber!