Look at what aging philanthropy has funded well over the past decade and it is an impressive list. Fall prevention. Dementia care and caregiver respite. Social connection. Age-friendly communities. Geriatric workforce pipelines. Advance care planning. Nutrition. Hospital at home. The field has become genuinely sophisticated about adding good years to a life. And underneath every one of those investments sits a question the field has mostly treated as someone else's department. Where will this person be living while we help her age well?

This piece makes one argument in five steps.

  1. Funders invest in longevity.
  2. Every longevity investment assumes housing stability.
  3. The housing system does not reliably reach the people those investments are for.
  4. Enormous existing housing capacity sits entirely outside the funding system.
  5. That capacity can be activated now, while the policy catches up.

1 and 2. Every longevity investment assumes a home

Housing is where every other investment in an older adult's life either compounds or leaks away.

If you fund hospital at home, or any model that moves care out of a facility, the model assumes there is a home, that it is stable, and that it will still be the same address next month. Delivery into unstable housing is the case that does not enroll, or enrolls and then disappears.

If you fund fall prevention, the grab bar goes in a specific bathroom. A forced move writes the modification off.

If you fund social connection, the connections are geographic. The neighbor who notices the mail piling up, the walking route, the congregation, the daughter 15 minutes away. When an older adult relocates, the typical distance is about 45 miles. That is not a change of address. It is the loss of the network your grant was building.

If you fund caregiver support, the caregiving is happening somewhere. Instability in either household ends the arrangement.

The uncomfortable version is short. A field can fund a great deal of healthy aging for a person whose housing is about to stop being something she can sustain.

3. The housing system does not reliably reach her

The intuitive story about affordable housing is scarcity: not enough homes, long waits, so people go without. That story is true and it is not the whole thing.

Income-restricted Affordable Housing has a maximum income, published by the government, which everyone knows about. It also has a practical income floor, which nobody publishes, because it comes from the building rather than from the government. Rent is a fixed number set by a table, so properties ask applicants to prove they earn two, two and a half, or three times it.

We measured the distance between those two limits in all 2,644 HUD income limit areas in the country. For an older adult on the average Social Security retirement benefit, seeking a one-bedroom at a three times requirement, the space between the most she may earn and the least she must prove is about $114 a month. Across all four affordability bands combined, she clears both tests in 7.7 percent of areas.

Too well off for the cheapest homes. Too poor for the rest.

One comparison brings it home. In Multnomah County, Oregon, a single older adult renting at market rate needs $38,100 a year to meet every basic need, according to the Elder Index. A property there, applying Portland's capped requirement, would need to see $43,320 to admit her to the subsidized apartment. The income required to get into the subsidized housing is more than the income she would need to live without the subsidy at all.

Two things make this hard to see, and both matter for how you read a grantee's numbers.

It never looks like an empty building. Surveyed tax credit properties report median physical occupancy of 97 percent. The apartments fill, because a somewhat better-off applicant takes the one she could not. The household who was turned away appears in no statistic anywhere. That invisibility is precisely why the problem has gone unfunded.

And this is not a marginal population. Households headed by or including someone 62 or over are now 42 percent of all HUD-assisted households, up from 33 percent a decade ago. They are the majority user of a system that was designed around somebody else, and nobody has re-examined the design.

The federal signal is not encouraging either. Section 202, the housing built since 1959 specifically for older adults with low incomes, has received nothing for new construction in fiscal 2025 or fiscal 2026, and the fiscal 2027 request proposes to eliminate its construction funding entirely. Waiting lists for the homes that already exist commonly run two to seven years or more.

A word to funders backing new supply

2026 has been a landmark year for housing commitments. Corporate capital in the hundreds of billions, a state bond measure heading to a November ballot, a permanent expansion of the housing tax credit, a housing abundance design sprint, a breakthrough challenge. As far as we can verify, the largest 2026 fund whose primary named population is older adults totals $8.3 million.

We want to be careful here, because we agree with the premise behind most of that money. The country needs substantially more housing than it is building. Nothing in our research argues otherwise and we would not want a single one of those commitments withdrawn.

What we would put on the table is a second question, alongside the supply question rather than instead of it.

Affordability restrictions expire. Federal Reserve Bank of Chicago researchers project that of the roughly 2.5 million tax credit homes active in 2022, about 40 percent will have left the program by 2035 once early exits are counted, and that the total may stop growing around 2031. Among properties that have already exited, roughly 61 percent of apartments remain affordable at the 60 percent level. None remain affordable at the 30 percent level.

So gross production is not net production, and the deep tier is the part that leaks. A strategy built on the unit count alone can report success in a decade during which the number of homes an older adult on a fixed income can actually rent has not moved.

Two questions worth asking any housing grantee, which cost nothing and change what you learn: what income multiple will the property manager apply, and how many of these homes carry rental assistance.

4. The capacity that already exists, and has been counted

Here is what makes this a fundable problem rather than only a lamentable one.

Our research, The Rooms Already Exist, counted from Census microdata about 35 million spare bedrooms in homes owned by adults 65 and over, against 4.5 million older renters spending more on rent than is recommended. Nearly eight rooms for every person in trouble. Every state and the District of Columbia holds more spare rooms than it has older renters in need. Housing all of them would take about 13 percent of those rooms.

And the same finding names both households at once. Alongside those 4.5 million older renters are 7.7 million older homeowners, about one in four, spending more for housing than is recommended in order to stay in homes they already own. Twelve million older households under housing pressure, on both sides of the same front door. One arrangement addresses both.

A home sharing arrangement has neither of the gates described above. No published income limit to exceed, no landlord multiple to document. As best we can determine it is the one form of housing supply this population is not screened out of on income, and it is available this year.

It is also not a substitute for construction, and we will not pretend otherwise. There is no rent held down by a published table, no 30-year restriction keeping it there, and no guarantee of the independence, accessibility or security of tenure a subsidized apartment is built to offer. It is a different form of supply. Which is exactly why the argument is parity, not replacement.

5. Fund activation, not just construction

America built serious machinery to create housing: a defined unit of production, tax credits, investor equity, permanent debt, insurance, guarantees, and regulatory credit for the institutions that take part. It works, and it deserves the credit it gets.

There is almost nothing equivalent for activating housing capacity that already exists. No unit of production for an activated bedroom. No incentive for placing one into affordable service. No risk infrastructure. No financing pathway. No recognized moment at which anything is deemed to have happened.

That is the gap, and it is the reason this is a philanthropic problem specifically. The activation pathway is efficient precisely because most of the money reaches a household directly rather than a transaction chain. Which is exactly why it cannot fund itself. Development finance generates fees, and fees fund the advocacy that produces policy. Nobody collects a fee when an older adult opens a spare room. This constituency has to be built deliberately, and philanthropy is the only actor positioned to pay for building it.

The two asks, and why they belong to the same gift

The service ask. Fund the connective work that makes matches happen now. Identity verification on both sides. Comprehensive background checks made available to the people deciding. A matching process built on how two households actually live rather than on a preference form. Agreement templates written for shared homes rather than borrowed from apartment leases. And the support that carries a match past the first difficult month, which is where arrangements either hold or fail. No capital stack pays for any of it.

The infrastructure ask. Fund the design and evidence work that makes activated capacity something the system can count. Housing Capacity Parity sets out what that requires: a defined unit of production, an incentive for placing a room into affordable service, financing mechanisms pointed at it, standardized risk and verification, and clarity on how room rental income interacts with means-tested benefits. It is written as an invitation to pressure-test, not a finished answer, and we would genuinely like it argued with by people who finance housing for a living.

We know how long recognition takes. Section 202 began in 1959. The housing tax credit was created in 1986 and took years to become the machine it now is. Nothing becomes a recognized, financeable intervention quickly, and we are not going to pretend this one will.

Which is exactly why we are asking for both at once. The policy work is a decade-scale project. The woman who is 78 and short of a screening requirement by more than half her annual income is on a different clock, and so is the homeowner two streets over who is about to list a house she does not want to sell. Neither of them can wait for a framework to be adopted. Both of them can be matched this year.

The rooms are already there. The people are already there. What is missing is the only part of America's affordable housing system still expected to run on goodwill.

Read next

Housing Capacity Parity is the framework, with the research agenda and the three questions we would put first. Who Can Actually Rent It is the evidence underneath step 3. The Rooms Already Exist is the capacity count.

If you would like to talk about either ask, write to the executive director at executivedirector@homeshareoregon.org.

Sources

Statement of interest. HomeShare Oregon operates a home sharing platform, and this piece makes a case for funding that work. We publish the research because home sharing is the one form of affordable housing capacity the country does not measure, incentivize or finance. The analysis of the regulated system stands independently of anything we do.