Until the old die, which they inevitably do, and then the transfer completes the cycle back to the young.
>largest, wealthiest population of non-working adults (retirees)
What does that have to do with affordability?
Most of the current income of these "retirees" is based on the work they did earlier in life (Soc. Security[0], 401k/IRA withdrawals). Further, you seem to be conflating "non-working" with being non-paid. Many of these retirees are providing unpaid daycare to grandchildren, unpaid assisted living service to other elder family members, or volunteer positions in the community.
[0]Yes, I understand that today's Soc. Security is funded mostly by today's wage earners, but not all of it. On an inflation adjusted basis, a good chunk of Soc. Sec. benefit is just the taxpayer's own FICA taxes that have been earning interest over time coming back to them, as well as the income taxes they pay on those very same Soc. Security benefits.