The Most Overlooked Risk in Retirement Planning: Longevity Without Flexibility
Good to Know
Longevity risk is commonly described as the danger of living longer than expected. In practice, the greater issue is living longer while relying on assumptions and withdrawal structures that no longer fit reality.
Traditional retirement planning often assumes predictable spending declines, stable withdrawal behavior, and gradual healthcare inflation.
Research from EBRI and Morningstar shows retirement spending patterns are far less linear than many planning models assume.1, 2
Some retirees reduce spending over time. Others increase spending due to travel, housing decisions, healthcare costs, or family support obligations.
Longevity amplifies every one of these variables.
Sequence risk also becomes more significant over longer retirement periods. Two retirees with identical portfolios may experience dramatically different outcomes depending on spending flexibility and withdrawal adaptability.2, 4
Consider two retirees entering retirement with identical portfolios. One adjusts discretionary spending during weaker market environments while the other maintains fixed withdrawals regardless of changing conditions.
The portfolios may begin identically, but the flexibility of the planning structure creates very different long-term sustainability outcomes.
Longer retirements also increase exposure to tax inefficiencies, Required Minimum Distributions, and IRMAA thresholds if withdrawal strategies are not revisited consistently.⁴
The strongest retirement advisors do not simply ask how long the money will last. They ask how adaptable the plan remains if the client lives significantly longer than expected.
The CFP Board’s Practice Standards emphasize that financial planning is an ongoing process requiring continuous reassessment.³
Longevity itself is not necessarily the greatest threat in retirement planning.
Rigidity is.
Sources
- Employee Benefit Research Institute (EBRI). Spending in Retirement Research. https://www.ebri.org/
- Morningstar. The State of Retirement Income. https://www.morningstar.com/retirement/an-updated-look-safe-withdrawal-rates
- CFP Board. Practice Standards for the Financial Planning Process. https://www.cfp.net/ethics/code-of-ethics-and-standards-of-conduct
- Kitces, Michael. Dynamic Retirement Withdrawal Strategies. https://www.kitces.com/blog/guardrails-retirement-income-rules-risk-based/
