True to his word, Mark Perry provided an update using the 2015 figures from the Census Bureau. As Mark states toward the end of his article;
Bottom Line: Household demographics, including the average number of earners per household and the marital status, age, and education of householders are all very highly correlated with household income. Specifically, high-income households have a greater average number of income-earners than households in lower-income quintiles, and individuals in high income households are far more likely than individuals in low-income households to be well-educated, married, working full-time, and in their prime earning years. In contrast, individuals in lower-income households are far more likely than their counterparts in higher-income households to be less-educated, working part-time, either very young (under 35 years) or very old (over 65 years), and living in single-parent households.
The good news is that the key demographic factors that explain differences in household income are not fixed over our lifetimes and are largely under our control (e.g. staying in school and graduating, getting and staying married, etc.), which means that individuals and households are not destined to remain in a single income quintile forever. Fortunately, studies that track people over time indicate that individuals and households move up and down the income quintiles over their lifetimes, as the key demographic variables highlighted above change…
Speaking for myself, the first part of the next part is dead-on accurate. Good Lord willing, the second half of the statement will be accurate, too.
It’s highly likely that most of today’s high-income, college-educated, married individuals who are now in their peak earning years were in a lower-income quintile in their prior, single, younger years, before they acquired education and job experience. It’s also likely that individuals in today’s top income quintiles will move back down to a lower income quintile in the future during their retirement years, which is just part of the natural lifetime cycle of moving up and down the income quintiles for most Americans.