Coast FIRE Number at 50: A Shorter Runway, A Larger Target

A fifty-year-old reading FIRE forums is often told, gently or otherwise, that they have missed the window. This is wrong. The window for early retirement at 40 has closed, but the window for Coast FIRE — stopping retirement contributions while continuing to work to current age — is open at any age where you have a portfolio and a planned retirement date.

At 50, with retirement at 65 and a $40,000 annual spending target, the Coast FIRE number is roughly $567,000.

Your numbers at 50

Using the 4% rule and roughly 3.8% real return over the 15-year horizon from 50 to 65.

What this looks like in practice

A 50-year-old needs about $567,000 today to hit Coast FIRE for a $40k retirement. That is 57% of the full FIRE target. Compound growth alone is expected to grow the portfolio by another 75% over 15 years to land at $1M in today's dollars.

For households that have been saving consistently since their twenties — even at modest rates — $567,000 by 50 is achievable. The catch-up contribution rules in tax-advantaged accounts (starting at 50) help. The 401(k) limit jumps to $30,500 in 2026 for those aged 50+, and IRA limits add a $1,000 catch-up provision.

Late start at 50

A 50-year-old with $0 invested today, contributing the catch-up-enabled $3,000/month (~$36,000/year, between 401(k) and IRA), reaches roughly $700,000 by 65 — past Coast FIRE for a $40k retirement, on the cusp for $50k. That is not a luxurious retirement, but it is meaningful, and combined with Social Security it produces a recognizable middle-class lifestyle.

Push the contribution to $4,500/month (achievable for households earning above $200k with low fixed costs) and the portfolio at 65 lands closer to $1,050,000 — fully funding a $40k retirement and covering some buffer.

Late start at 50 is the hardest scenario in this series, but the word for it is hard, not impossible. The realistic plan is "delay retirement to 67 or 70, save aggressively until then" — which still leaves a meaningful retirement period and avoids the worst-case scenario of working until you cannot.

Early start at 50

A 50-year-old with $800,000 already invested is well past Coast FIRE for a $40k retirement. The existing balance alone compounds to roughly $1.4M in today's dollars by 65. That funds about $56,000 of annual retirement spending — a comfortable middle-class number.

Households in this position face a much more interesting question than the late starter: should we retire at 60 instead of 65? Five years earlier requires only modest additional saving — perhaps an extra $200,000–$300,000 in the portfolio — and the 15-year compounding window does most of that work for free. Many 50-year-olds at Coast FIRE quietly pull their retirement date forward by several years without telling anyone.

The shape of the next fifteen years

Three things matter more at 50 than at younger ages.

Asset allocation. With 15 years until retirement, a 100% stock allocation may be more volatility than necessary. Most planners shift toward a glide path — slowly increasing bond allocation through the 50s and into the 60s. The Coast FIRE math gets harder when you mix in bonds (lower expected return), but the realized return becomes more reliable. The Coast FIRE number above assumes equity-like returns; adjust down if your allocation is more conservative.

Healthcare. A 50-year-old planning to retire at 65 will be on Medicare on day one. A 50-year-old planning to retire at 60 has five years of bridge healthcare to cover — typically the most expensive bridge in early retirement. Budget for it explicitly.

Sequence-of-returns risk becomes acute. A 30% drawdown at 55 is much harder to recover from than the same drawdown at 35. The standard hedge is to not fully stop contributing — even $1,000/month in extra savings after crossing Coast FIRE significantly insulates against bad markets in the late 50s and early 60s.

Why 50 still matters

The temptation at 50 is to either despair (if behind) or coast aggressively (if ahead). Neither is right. The reality is that 50 is a normal age to be running these numbers — not unusually late, not unusually early. Most people who retire on schedule in their mid-sixties did their hardest saving in their forties and fifties, not their twenties and thirties.

The Coast FIRE framework still applies. The questions are still: how much do I have, how much do I need, and how many more years of contributions stand between them? The runway is shorter, but the question is the same.

Run your numbers at 50

Open the calculator with currentAge=50 prefilled. Adjust your current portfolio and contribution rate, and the chart will show whether compound growth alone is enough — and, if not, how many more years of saving will get you there.

For the broader table and methodology, see the Coast FIRE Number by Age overview.