Adults 65 and older now outnumber children age 5 and under across the entire planet, for the first time in recorded history -- a demographic crossover the U.S. Census Bureau documented in its "An Aging World: 2025" report, released in late August 2026 with demographers from the Australian National University.^[1] The share of people 65 and older worldwide is projected to nearly double again, from 10.5% today to 19.6% by 2060, as the global 65-plus population passes 2 billion people.^[1] Andrew Scott, a contributor to the Census report, put the implication plainly: the shift "could force societies to rethink old age as an economic asset rather than simply a cost."^[1]

Metro Atlanta is that global trend line, run at regional scale, with a start date already on the calendar. And 500 miles northeast, in Richmond, Virginia, a market-driven fix to the same pressure is already running -- not as policy, but as thousands of individual households quietly renting out the bedroom nobody's using anymore.

A region built for a population it no longer has

The Atlanta Regional Commission's own population forecast is unambiguous: by 2050, the 11-county Atlanta region will be home to more than 1.3 million residents age 65 and older, a 122% increase from 2020 -- making 65-and-up the fastest-growing age cohort in the region.^[2] By ARC's own accounting elsewhere in the same plan, that works out to 22% of the region's population, nearly 1.4 million people, within a single generation.^[2] The shift isn't abstract at the household level, either: ARC's own tracking shows the number of children under 5 per resident 65 and older in the 11-county region falling from 3.9-to-1 in 1980 to 1.7-to-1 in 2024 -- the same global inversion Census just confirmed, already most of the way finished in metro Atlanta specifically.^[2]

ARC built the region's transportation network, sidewalks, and subdivisions for a much younger, much more car-capable population than the one it's about to have. The agency's own Age-Friendly Atlanta Region Action Plan, adopted in May 2026, says as much directly: transportation "remains one of the top concerns older adults raise in ARC's community engagement, particularly in parts of the region where walking is unsafe and transit options are limited."^[2] That's not a minor caveat in a famously sprawling, car-dependent metro -- it's the constraint on whether hundreds of thousands of additional older residents can get to a doctor, a grocery store, or each other without driving. Money tightens the constraint further: on the 2025 Metro Atlanta Speaks survey, 43% of respondents 65 and older said they didn't have enough cash on hand to cover a $400 emergency expense.^[2] A generation that can't absorb a $400 surprise is not a generation that can easily absorb a second car payment.

ARC's own plan for it: build more roommates, not just more sidewalks

ARC's action plan doesn't just flag the mismatch -- it names a fix, and the fix is instructive because it isn't primarily about pouring more concrete. Alongside mobility hubs, walk audits, and pedestrian infrastructure repair, the plan's housing initiative explicitly calls for the region to "promote multigenerational housing models such as co-housing, home-sharing, and eco-villages, supporting family economic mobility."^[2] The region's own planning agency has concluded that part of the answer to an aging, car-dependent metro isn't more infrastructure at all. It's more people per house.

Richmond is already running that fix, informally, at scale

Richmond didn't wait for a regional plan to say so. About 14.5% of the city's residents are 65 or older, and the average Richmond apartment now rents for roughly $1,439 a month, up again year over year.^[4][5] Nationally, older Americans are the one group with a built-in structural advantage for solving that math themselves: research from the Federal Reserve Bank of Richmond finds that a quarter of households headed by someone 65 or older have at least two spare bedrooms, more than double the share among households under 65.^[3] The generation with the least income flexibility to absorb rising housing costs is, disproportionately, the generation sitting on the most unused square footage in the country.

That gap is exactly what a growing home-sharing industry now exists to close. Roughly 55 organizations nationwide currently work as home-share matchmakers, vetting both sides of an arrangement -- pets, smoking, parking, who controls the thermostat, whether a newcomer does a few hours of chores like snow shoveling or grocery runs in exchange for reduced rent.^[6] It isn't a niche fix for a small problem: about a third of households headed by someone 65 or older were already cost-burdened in 2024, spending more than 30% of their income on housing, and nearly 80% of those burdened households were homeowners -- meaning the equity and the empty bedroom were often sitting in the very same house as the budget problem.^[6] Fairfax County, Virginia has taken the idea further than most local governments, promoting home-sharing directly through its Department of Family Services as a way for older residents to lower housing costs and stay in the communities where they've already built their lives, complete with its own how-to guide for pairing a host with a guest.^[7]

Put the two cities together and the pattern is one story, not two. Atlanta is the scale problem: a sprawling metro built around driving, about to add hundreds of thousands of residents who are statistically less able to drive, less able to walk it, and less able to absorb a bad month financially. Richmond is the mechanism-level answer already running underneath the headlines, built not by a regional planning agency but by individual households doing the math on an empty bedroom and a rent check. ARC's own action plan points at that same mechanism as one of its ten official initiatives.^[2] The infrastructure fix -- mobility hubs, sidewalks, transit -- will take a generation and a lot of public money to build. The housing fix is sitting, unused, in bedrooms that already exist.

Why does this matter? The usual framing of an aging population is a cost story: more retirees, fewer workers, a strained safety net. That framing is real, but it skips the part that's actually solvable on a normal timeline. The infrastructure gap Atlanta is staring down -- a car-dependent region about to hold 1.3 million residents 65 and older -- is a decades-long, capital-intensive fix that a regional commission can plan for but can't finish quickly. The housing gap Richmond is already closing is not that kind of problem. It doesn't require a bond issue or a new rail line. It requires treating an empty bedroom as inventory, matching it to a renter who needs one, and putting guardrails -- vetting, agreements, a matchmaker who's done this before -- around a transaction that used to happen only through word of mouth. Andrew Scott's reframe of old age as "an economic asset rather than simply a cost" isn't abstract in Richmond. It's a homeowner over 65 covering their own rising costs by putting a spare room to work, while a renter half their age gets housing they can actually afford. Metro Atlanta's own planners have already put that same fix on their ten-point list. The open question is whether it gets built out at the speed the 122% demands, or whether it stays the tenth priority behind sidewalks and transit hubs that take twenty years to fund.