If you’re over 16, your passport lasts 10 years. Under 16? 5 years. That’s the short answer to the headline question. But the longer, cooler answer is: it depends on who’s looking at it.
Always check the “entry requirements” for your specific country online. Don’t just look at your passport’s expiry date—look at the issue date too. That’s the secret sauce.
And if you’re within 6 months of expiry, just renew early. It’s a pain, yes, but it’s cheaper than a cancelled flight. Plus, a fresh new passport makes you feel like you’ve leveled up in life.