Firstly, consecutive years are in fact shown as well in the data linked: 56% of Americans spent 2 consecutive years in the top 20%, and 35% spent 2 consecutive years in the top 10%.

Secondly, these numbers are based on tax filings, and even though the process of the sale of grandpa’s dairy farm may straddle 2 years, the income from the sale isn’t realized across 2 years; it will always register as a single fiscal year, I.e. the year in which the transaction closed. The actual income is not realized until then.

Further, it’s not at all obvious that only considering consecutive years is necessary to invalidate the original GGP claim. The fact that 40% spent 2 not-necessarily-consecutive years in the top 10% (and 62% for the same in the top 20%) especially debunks the notion that one-time inheritance sales make up the variance. Nobody is selling grandpas dairy farm across 2 disjoint years. It also shows us that people do in fact move in and out of these quintiles (or deciles) as one would expect in a dynamic economy, and that those groups aren’t just a static cabal of people twirling their mustaches.

The crux of the argument stands: the majority of Americans experience affluence by spending at least 2 years in the top 10-20%. And at the very least it totally invalidates the absurd claim made (quite confidently, at that) in the GGP comment:

> Most American never get anywhere close to the top 10% - not even remotely - regardless of age. The idea that everyone is just waiting around for their career to advance enough to put them in the upper-middle class is ludicrous on its face.

It’s just outright misinformation.

It's not even misinformation, when you realise the headline is about wealth and not income.

Even if we're talking about wealth and not income, the amount necessary to be in the top 10% wealth is...not that much.

It's about $800,000 in net worth: https://dqydj.com/net-worth-percentile-calculator-united-sta...

This is largely attainable for the majority of Americans when you factor in the value of one's home, retirement accounts, and general lifetime savings. Keep in mind we're not talking about how much net worth the majority of Americans have at any snapshot-in-time, we're talking about the maximum net worth attainable in one's lifetime, and what that looks like for the majority of Americans.

There's absolutely no evidence that the top 10% wealth holders has been a static group of people over the last 60 years.