If a table says your life expectancy is 84, it does not mean you need precisely thirty-nine years of money at 45. It means a population average is being mistaken for a personal appointment.
Use three horizons
The financial horizon protects against living longer than expected. The healthy horizon estimates years with the energy and mobility for demanding experiences. The intimate horizon asks how long parents, partners, and friends are likely to share those years.
One number cannot do all three jobs. A conservative financial horizon can coexist with urgency about the next decade.
Plan asymmetrically
Running out of money at 92 is dangerous. Postponing every meaningful experience until 72 is also dangerous, but calculators do not flash red for it. Put time-sensitive activities earlier while preserving a durable floor for late-life housing, care, and dignity.
This is not permission to assume an early death. It is permission to notice that a dollar at 50 and a dollar at 90 buy different categories of life.
Review every birthday
Update health, family history, spending, and priorities. The horizon should move as evidence changes. So should the balance between security and use.
Read Your FIRE Number Should Shrink Every Birthday beside The Five Regrets of the Dying, Re-examined. The aim is not to predict the final year. It is to stop an average from making every preceding year look interchangeable.
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