When it says at least 15 days What are they trying to determine here not more than 15 days before your visa renewal date or at least 15 days before your visa renewal date? It wold be great if you could fill in your departure card details this way.
I read on other forua that you can get a letter from your embassy confirming your annual income and that this meets the funds requirements to apply for a retirement visa, It was costing him significantly less than what he was quoted by many agencies.