Saying that there's wealth deficit for millennials/genx because boomers have accumulated more wealth later in life is a little handy-wavy.
What did the boomer chart look like when they were 20-35? What will the genx chart look like when they're 50-70? And what will the millennial chart look like when they're 30-70?
Edit - 70+ for everyone would be good too.
That's not what the chart I linked is claiming. The Boomer line goes back to when they were 35. Not sure what the data limitations were preventing it from going back further. Meanwhile all age data is shown for Gen X.
I'm not sure what you mean about the future chart? I guess we'll have to wait and see :-)
But anyway, this chart appears to answer the question: "which generation had more relative wealth in its early 30s?"
Leaving out boomer data from ~18-35 makes me a little more suspicious of cherry picking because that data could be similar. It may also show boomers gaining even more wealth, but if it's not available we can't know.