You only get the fuel allowance at the age of 60 automatically if you apply early otherwise you wait the queue, this is the one fact the government do not advertise, strangely enough it is the same for Bus passes. I did hear that the fuel allowance can be back dated, but that would need more investigations.
Gordon received his at 60 bus pass and fuel allowance (5 years ago). We were sat in the doctors on our return to UK (after the ex-pat rumour mill saying we would not be able to see a doctor for 6 months, and we registered after only 3 days) and listening to a conversation realised that he was entitled to this benefit, and me being the mercenary that I am claimed it!!!!
Sometimes it pays to listen at bus stops, shop counters and doctors surgeries