In 1989 (the first year in the Fed's data), the Baby Boomer generation held $4.33T in wealth, which would be $9.5T in today's dollars, while in 2021, the Millennial generation held $7.47T in wealth [1]. While that's a little bit less, it's important to keep in mind that the median age of the Baby Boomer generation was 34 in 1989, vs 32 for the Millennial generation in 2021. If you linearly extrapolate Millennial wealth growth, the generation would hold $10.5T in wealth at a similar age.
So what the linked chart really reflects is that the total size of the pie has gotten much larger in the past 30 years. Most of the increase has gone to older generations, but I think that's neither surprising nor undesirable -- after all, 30 years ago, the Millennial generation ranged from not being born yet to elementary school. Will the pie continue to grow over the next 30 years so that Millennials can see a similar increase in wealth (and hear complaints from the kids being born right now)? I'd imagine that's largely up to the decisions we make today.
[1] https://www.federalreserve.gov/releases/z1/dataviz/dfa/distr...
The chart also ignore the population share of each generation - Baby boomers made up a massive part of the US population - 70M out of a population of about 210M (1980) or 33% when they hit working age.
Millennials are slightly larger in numbers - 72M, but smaller part of the total of 330M (2020) or 21%.
Crude analysis and you’d have to assume everything else remains the same (it doesnt), but if all wealth was equally distributed by age you’d expect Millenials (of the same age) to have about 33% less share of the total wealth based on population alone.
Which isn’t far off from that chart if you assume Millennials track similar to Gen-X.
https://www.marketwatch.com/story/this-depressing-chart-show...