It's about 3 months old!!!
It will have more dust in a year, but not much more!!! (If I still have it in a year) I clean it religiously once a month.
The second case (the father-in-laws) is almost a year old. It was built in November, and this pic was taken about 2 months ago.
Really, it is hard to think what things look like after a year, most parts, including the cases, get changed within 7-9 months. I'll probably keep the Antec case for a while, but it will get a complete cleaning when the mobo gets changed in 2 months or so... that really helps keep things clean.....