The vaccine-order rules are indeed quite strict in many countries. i live in Norway and here the vaccines have always been given in a set order, with the oldest and sickest first. The group 25-38 got their first vaccine last, and many didn't get the first one until about August, which means they didn't get the second until October/November. This group will most likely be offered the 3rd dose starting around mid-february, though many won't be able to get it yet because they have to wait 5 months. I was lucky to get mine sooner as I'm part time health worker and got to skip the line a bit, very happy about that as it'll make my trip in two weeks easier.
Sometimes you have to be a little bit naughty.