That's where the wikipedia numbers come from. If you look at the 'distribution of wealth' heading, skip to the graph, and go to the big giant table, you'll see them.

And we're apparently just going to have to disagree, unless you can find some numbers and scale them yourself. I'm still not sure how age is a significant differentiator, and on top of that, it doesn't matter if the people who own everything are old or not. They still own everything.