Average Wealth in Adjusted Dollars by Age is a way more sensible graph so you don't have arbitrary "generations" that you also have to mentally align and scale for population size.

This one stops at 2010, but as you can see it's been basically flat for younger than 50. The reason why the elderly amass more wealth is because they're living longer. Wealth turns over to younger generations through inheritance or paying for nursing homes. American living an extra 10 years in 2010 vs 1960 means their wealth hasn't turned over yet.

Maybe it changed a lot after 2010 or it doesn't seem like there's much of a problem.