A three-year-old Reddit thread from r/BoomersBeingFools went viral again this month, with millions relating to a poster who wrote: “Not an issue, we refuse to take care of you. Old folks home it will be.” The post was originally written in response to a Vox article warning Millennials were unprepared for a coming elder-care crisis, and its resurgence this July coincided with the symbolic milestone of the first Boomers turning 80.

As the Wall Street Journal reported, citing demographer William Frey of the Brookings Institution, roughly 4 million Baby Boomers will hit that age this year, the first wave of a 76 million-strong generation. Commenters piled on with grievances about housing costs, student debt, and a dismantled social safety net, arguing their refusal to provide care is simply “a consequence” of decisions Boomers made.

It reads like generational war. But the data shows something quite different is actually happening in most American homes.

The sad reality: They’re already doing it

Far from opting out, Millennials are quietly becoming a caregiving generation almost by default. According to a Population Reference Bureau fact sheet, the number of family caregivers assisting older adults grew 32% between 2011 and 2022, rising from 18.2 million to 24.1 million, and adult children remain the single largest category of family caregiver in America, at 40.7%.

Multigenerational living is climbing, too—over 66 million Americans, roughly one in four, now live in multigenerational households, a trend Pew Research attributes primarily to financial necessity rather than family devotion, but one that functionally deepens caregiving obligations rather than erasing them. The venting on Reddit, in other words, is a mood. The Bureau of Labor Statistics data is a workload.

The reality played out differently

Several structural forces explain why Millennials remain stuck providing care they swear online they’ll refuse. In an interview with LiveNOW from Fox, Washington Post reporter Federica Cocco explained that families are smaller than they used to be, leaving fewer siblings to split caregiving duties: “My grandmother had six children. They’re taking care of her now in rotation. My mother has two children, and I myself only have two.” Adults are also more geographically dispersed from aging parents than prior generations, and there’s a documented shortage of paid care workers pushing responsibility back onto unpaid family members.

The burden is intensifying just as the tools to plan for it are failing families. Cocco cited the case of a man named Conrad Miles, who saved $200,000 for retirement and did “everything right,” only to have his daughter watch that entire cushion evaporate—he died at 93 with just $30,000 left, barely enough for a few months of assisted living. Nearly one in five Americans will require high-intensity long-term care for more than three years, according to Boston College’s Center for Retirement Research.

And the inheritance isn’t showing up either

The bitter irony is that the reward Millennials might once have expected in exchange for this caregiving—the fabled “greatest wealth transfer in history”—is evaporating in real time. According to Realtor.com’s analysis of new Visa Business and Economic Insights data, Boomers hold roughly $93 trillion in assets, but only about $36 trillion is likely to actually reach Gen X and Millennial heirs over the next 20 years—roughly 39 cents on every dollar—once retirement spending, debt, taxes, and fees are subtracted. “The house is usually the last asset left in retirement,” said Evan Mills, an associate financial adviser at Scholar Advising, quoted in the piece, “so it often turns into a retirement emergency fund before it ever becomes the children’s inheritance.”

So the actual picture looks less like defiant Millennials abandoning their parents in “old folks homes,” and more like millions of them quietly footing both the labor and the financial cost of aging parents, with a shrinking inheritance waiting at the end of it—if anything is left at all. The revolt, it turns out, is happening mostly in the comments section.

For this story, Fortune journalists used generative AI as a research tool. An editor verified the accuracy of the information before publishing.