28 years old — how early can compounding set you free?
Age
28
Location
Dallas, TX
Income
$138k/yr
Saved
$115k
A 28-year-old Dallas developer earns $138k, saves $23k per year into a 401k, contributes to an HSA, and keeps lifestyle expenses lean at $48k. With $115k already invested and decades of compounding ahead, the calculator maps out when a semi-retirement consulting gig at 45 and full retirement at 50–55 becomes feasible.
The earliest retirement age at which this plan does not run out of money is 40, after 7 more years of full-time work. Market risk matters more than that headline: the earliest age that succeeds in at least 80% of 500 Monte Carlo simulations is 42.
| Retire at | Full-time years left | Semi-retired years | Best Monte Carlo success |
|---|---|---|---|
| 40 | 7 | 5 | 57% |
| 41 | 8 | 5 | 70% |
| 42 | 9 | 5 | 82% |
| 43 | 10 | 5 | 92% |
EARLIEST 80%+ PLAN: Retire at Age 42 Switch to semi-retirement at age 37 (after 9 high-salary years). Portfolio bridges to full retirement at 42.
Growth rate (4.0%) keeps compounding during spending — the extra buffer matters most against bad early-retirement market sequences.
Social Security: $30k/yr starting at age 67 is included. Healthcare: $10k/yr before Medicare at 65. HSA: $8k balance, ta
Across the simulated market histories (in future dollars, not adjusted for inflation), the median portfolio is $1.75M at 70, $2.18M at 80, $2.73M at 90. In a poor sequence of returns (10th percentile) it is $0k at 70, $0k at 80, $0k at 90.
This example uses illustrative figures and should not be treated as financial advice.