Not sure I can give age. Not really old but then again I have been around for a while also so it depends on what you consider old
It looks like they do not have ball bearing slides, this is indicated by lack of a sticker on front saying it has such. The bottom box comes in 2 levels
http://www.sears.com/craftsman-26in...p-00912733000P?prdNo=5&blockNo=5&blockType=G5
Sorry about the color but I didn't want to look through and find red. Notice how the side of the box is flat sheet metal. I think this is what the for sale box looks like. I have an older one of these, mine was tweeked by a fall before I got it, but I think overall structurally this is a weaker design and can get tweeked easier with these thin sheet metal boxes
http://www.sears.com/craftsman-26in...0913247000P?prdNo=14&blockNo=14&blockType=G14
IMHO this design is a bit better with the tubular frame. I have a bigger 9 drawer bottom with this design and am really impressed by how much stronger the bigger box feels (also 26" wide)
Something important to think about. The 5 drawer models like that have 6" tall bottom drawers. They can get overloaded quite easily and bent out of shape and broken. Although I don't have an example of this I can attest to what friends of mine did with theirs

Make sure all the drawers line up well and do not bind anywhere.
Personally, I have never thought to be in a hurry to buy something. I will always wait for something I think is cheap (of course then you have to be prepared to get there quick with cash) I wouldn't pay more than $150 for those 2 boxes, if the bottom was the better one, but of course that is also here.