I'm not suggesting you do this, as it is obvious that you will care for him very well in his old age, but if you ever feel he IS suffering (and I would only think of this if he was physically damaged in some irreparable way) the kindest way to send a gecko off is to cool him gradually so that he goes into a soporific state (for example, strong air conditioning, then transferral to a fridge). Once you are sure he is unresponsive, move him to the freezer and leave him overnight. Never put a moving animal directly into the freezer, as this would cause pain, but gradual cooling is more like a deepening anaesthetic.
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