What Age Can You Retire? Your FIRE Age Explained

What Is Your FIRE Age?

Your FIRE age is the age at which you reach your FIRE number — the point where your investments can sustain your living expenses indefinitely. It's the single number that matters most in early retirement planning.

Unlike traditional retirement age (65-67), your FIRE age is entirely within your control. It's determined by three inputs:

1. Your savings rate (the percentage of income you save) 2. Your current savings 3. Your investment returns

Because your savings rate is the dominant factor, the same person could retire at 45 or 65 depending almost entirely on how aggressively they save. Our FIRE Age Calculator shows you exactly when you'll hit your number based on these inputs.

The Savings Rate Table

Your savings rate is the single biggest determinant of your FIRE age. Here's the classic table (assuming 5% after-inflation returns and starting from zero):

- 10% savings rate → ~51 years to retirement - 20% savings rate → ~37 years - 30% savings rate → ~28 years - 40% savings rate → ~22 years - 50% savings rate → ~17 years - 60% savings rate → ~12.5 years - 70% savings rate → ~8.5 years

This is the famous 'shockingly simple math behind early retirement.' Someone starting at 25 and saving 10% retires around 76. Saving 50% instead means retiring around 42. The difference is your savings rate, not your income.

The Levers That Move Your FIRE Age

Three levers determine how early you can retire:

1. Increase income — The most powerful lever, because it has no ceiling. A $10,000 raise that's fully saved adds $10,000/year to your investments — and because it boosts both your savings rate AND your absolute savings, it compounds.

2. Decrease expenses — The fastest lever. Cutting $500/month of spending both frees up $500 to invest AND lowers your FIRE number by $150,000 (at a 4% withdrawal rate). It's a double win.

3. Increase returns — The slowest lever. Moving from a 0.5% fee fund to a 0.03% fund adds ~0.5% to your return, shaving 1-3 years off your timeline. Helpful, but smaller than income or expense changes.

Most FIRE seekers attack all three, but income and expenses move the needle most.

Why Income Matters More Than You Think

There's a persistent myth that FIRE requires a massive income. The truth is more nuanced:

A person earning $50,000 who saves 50% reaches FIRE in ~17 years. A person earning $200,000 who saves 10% reaches FIRE in ~51 years. The $50,000 earner retires first.

This is because FIRE is fundamentally about the gap between income and expenses. A high income that's entirely spent produces no wealth. A modest income with a high savings rate produces wealth quickly.

That said, income matters enormously when combined with a high savings rate. The person earning $200,000 who saves 50% reaches FIRE dramatically faster than the $50,000 earner — because they're saving $100,000/year versus $25,000/year. The ideal is high income AND high savings rate.

How to Retire Years Earlier

If you want to move your FIRE age earlier, here's where to focus:

1. Audit your three biggest expenses — Housing, transportation, and food typically account for 60-70% of spending. Cutting $300/month from each shaves ~4-5 years off your FIRE date.

2. Bank every raise — Increase income by $5,000 and save 100% of it. Repeat every year.

3. Lower your investment fees — A 1% fee difference can add 2-3 years to your timeline.

4. Track your savings rate monthly — What gets measured gets improved. Use our Savings Rate Calculator to compute yours, then our FIRE Age Calculator to see how changes move your retirement date.

Remember: your FIRE age is a moving target you control. Every 1% increase in savings rate, every $100 cut in monthly expenses, and every fee you eliminate pulls that date closer.