I've just had a thought about my older son's passport. It was issued 4 years ago this month, when he was 1 1/2. He was a lovely chubby faced toddler then but, although still very lovely, he is obviously 4 years older and has a much thinner face now. Does the fact that the passport have a validity of 5 years mean that as long as he still bares some resemblance to that chubby faced toddler, his passport will be accepted? INZ have obviously seen his passport and a current picture of him on the application and didn't question it. What do you think, will it be an issue at check-in/Immigration?