I know that they won’t allow anyone to fly out of the country with less than 3 months left on a passport.
Ours are due in November. Hubby didn’t use his at all in the past 10 years, so I am not renewing it. He will be 86 in October, and not able to do transatlantic flights.
I had traveled to England 25 times in 24years, up until he had the cerebral hemorrhage, and benign brain tumor. So only went twice at the start of the passport.
I went ahead and did mine online. I had to send my passport back to England, so without one right now. That’s not a problem, but being a British Citizen, I must always have a passport.