How Long is a Passport Valid? How long is a passport valid? An adult passport is valid for 10 years. A child passport is valid for 5 years. Be sure to check your passport validity before your travel date. Please review the expiration date of your US passport regularly so you do not end up in a pinch when it is time for passport renewal. Many travelers do not realize the importance of checking for passport validity, even though it is a quick way to sideline a trip.