How does an age difference affect survivor income?
Priya is 62 and Marcus is 72. This fictional case study shows why a married retirement plan must track two ages, two lives, separately owned IRAs, and the household's transition to one survivor.
Written by James Wilson · Calculated and reviewed August 10, 2026
Starting plan inputs
| Household | Married filing jointly in Oregon |
|---|---|
| Ages at projection start | Priya 62; Marcus 72 |
| Modeled life expectancies | Priya 82; Marcus 96 |
| Traditional IRAs | Priya $575,000; Marcus $240,000 |
| Roth IRAs | Priya $80,000; Marcus $35,000 |
| Taxable savings | $90,000 shared |
| First-year spending | $76,000; reduced to 72% after the first death |
| Social Security comparison | Both claim at 67 in the displayed projection; Priya's age-67 estimate is $3,000 per month and Marcus's is $1,850 |
| Pension | Priya receives $2,600 monthly from 65, fixed with no COLA; 50% continues to Marcus after her death |
| Model assumptions | Balanced allocation, Lower Long-Term Returns, 2.5% baseline inflation, no Roth conversions, healthcare included in spending, and Simple Deterministic Medicare |
| Dollar reference | Social Security estimates and first-year spending are entered in 2026 dollars |
Breakdown of the model
- Two age tracks: each calendar year advances Priya and Marcus independently, so Marcus is 92 when Priya reaches 82.
- Social Security: the household receives both eligible benefits while both are living. After a death, the modeled survivor generally keeps the higher available benefit rather than both full checks.
- Pension: Priya's full pension stops at her death and the entered 50% survivor amount begins for Marcus.
- Accounts: the spouses' IRA balances remain separate for RMD and tax calculations, then transfer to the modeled survivor under the plan's sole-beneficiary assumption.
- Household transition: spending falls to the entered survivor percentage and the tax filing status changes from joint to the modeled survivor status.
Projected results
These results use the planner's smooth deterministic path: the Balanced allocation, Lower Long-Term Return preset derived from 20-year rolling historical periods, and 2.5% inflation. Future dollars are the amounts expected in that future year; inflation-adjusted dollars translate them to starting-year purchasing power.
| Result | 72% survivor spending | 85% survivor spending |
|---|---|---|
| Age-80 portfolio, future dollars | $2,388,525 | $2,388,525 |
| Age-80 portfolio, inflation-adjusted dollars | $1,531,441 | $1,531,441 |
| First survivor year | 2046: Priya 82, Marcus 92 | 2046: Priya 82, Marcus 92 |
| First survivor-year Social Security | $58,990 | $58,990 |
| First survivor-year pension | $15,600 | $15,600 |
| Modeled depletion | None through the projection | None through the projection |
| Ending portfolio, inflation-adjusted | $1,212,418 | $1,182,656 |
The age-80 balances are identical because Priya's modeled death occurs later, at age 82. The higher survivor-spending assumption reduces the later cushion by about $29,800 in today's purchasing power. Ending balances include assets remaining after the modeled lives end and should not be interpreted as money available to either spouse at age 95.
Results across 1,000 simulated futures
Risk Analysis uses the same Simulation Seed, lower-return target, and recentered variable inflation for both spending versions. “Very Cautious” is the balance that about 90% of modeled futures equaled or exceeded. It is not a guaranteed minimum.
| Modeled risk result | 72% survivor spending | 85% survivor spending |
|---|---|---|
| Success through age 80 | 100% | 100% |
| Success through the modeled end | 100% | 100% |
| Very Cautious age-80 balance, inflation-adjusted | $856,286 | $856,286 |
| Middle age-80 balance, inflation-adjusted | $1,546,365 | $1,546,365 |
| Very Cautious ending balance, inflation-adjusted | $586,008 | $558,312 |
| Middle ending balance, inflation-adjusted | $1,191,258 | $1,160,119 |
Both versions cover modeled spending in all 1,000 paths, so the meaningful comparison is the remaining margin rather than the rounded success rate. The survivor-spending change appears only after Priya's death and lowers both cautious and middle ending outcomes.
What Priya and Marcus could learn
- A survivor-spending change has no effect before the first death, which is why the two age-80 results match.
- The first survivor year deserves its own review: one Social Security check ends, the pension changes, filing status changes, and many household costs remain.
- The order of deaths matters. A benefit owned by the first person to die may continue at a survivor percentage; a benefit owned by the surviving person generally remains that person's own benefit.
- When both success rates round to 100%, cautious balances and year-by-year cash flow reveal differences hidden by the headline percentage.
- They should test more than one survivor-spending estimate because housing, property taxes, and many healthcare costs may not fall in proportion to household size.
How to recreate the study
- Load the study and select the 67 / 67 · No Conversion row.
- Open Year-by-Year Details and compare 2045 with the first survivor year, 2046.
- Review Social Security, other retirement income, filing status, IRA ownership transfer, taxes, spending, and ending portfolio.
- Change Spending After First Death from 72% to 85% while leaving every other input unchanged.
- Compare deterministic results and run Retirement Risk Analysis for both versions.
Related guides and resources
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