Under new Brexit terms, your passport must have been issued in the last 10 years.
The rule could be a huge blow to thousands of families who want a holiday with their kids during the October half-term.
Even if you have 12 months left, you could still be denied travel if the passport has passed its 10-year timeline since it was issued.
Travel expert Simon Calder told BBC Radio 4: "It all goes back to Brexit.
"If you remember before when we were in the European Union all the way up to the transition period it was really straightforward.
"If you had a British passport, you could go to the EU and stay in any of those countries up to and including the expiry date.
"Your passport has to meet two conditions which the EU has long had in place for third countries, which is what we are now."
A passport needs to be valid for at least three months after the date you intend to leave the EU.
And it has to have been issued within the last 10 years.
Simon added: "Many of us didn't even notice in January because international travel was banned.
"But once trips were allowed again, many people have checked the expiry date and not the issue date."
Up until September 2018, the policy for passports gave individuals credit for unspent time when renewing their passport.
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Simon continued: "So you could have a passport issued in 2011 that may not expire until 2022, but then the rule kicked in and for the EU any non-members passports are deemed to have expired after 10 years."
It comes as the rules for international travel to English will change from red, amber, green traffic light to a single red list of countries from October 4.
The rules for travel from countries and territories not on the red list will depend on your vaccination status.
If you arrive in England before the date, you must follow the current rules.
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