I edit the text and turned it into a list.
How much money each generation has saved for retirement
According to Northwestern Mutual’s 2021 Planning & Progress Study, which surveyed more than 2,000 American adults...
The adults of gen Z (ages 6 to 24) have an average of $35,900 in personal savings and $37,000 saved for retirement.
Millennials (ages 25 to 40) have an average of $51,300 in personal savings, while their retirement accounts have an average balance of $63,300.
Gen Xers (ages 41 to 56) are slightly ahead of their younger counterparts, with an average of $67,100 in their personal savings and $98,900 put away for retirement.
Baby boomers (ages 57 to 75) have an average of $102,400 in personal savings and $138,900 in their retirement accounts.
Edit
Source: Northwestern Mutual - Planning & Progress Study 2021
The sample size is actually not that bad, however it's not random, so it's garbage.
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2400 people gives you a margin of error of 2% (for a 95% confidence interval).
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Having flashbacks to math class?
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Yep. Note this only works if your variable is distributed like a Gaussian though (however even if it is not, there are other sampling techniques).