The OED defines an elder, simply, as the senior of two or more individuals - no age specified. 'Elder', as an adjective, conveys the same meaning. This is an interesting question. There are no standard industry answers, just as there isn't a standard label (senior, senior citizen, elderly, old, 65+, etc.)
Bake the trout for 10 minutes, then unfold the packet far enough to check the doneness. When done, trout is moist and flaky with an opaque appearance. Return the fish to the oven and continue baking if necessary. Trout usually cooks within 20 minutes, but may require up to 30 minutes, depending on the size of the fish.
Keep in the refrigerator until shortly before cooking. When ready to grill, preheat your barbecue grill. Place prepared trout packets onto your preheated grill with indirect heat. Close lid and cook approximately 15 to 20 minutes (depending on the size of your fresh trout).prinkle salt and pepper on the inside and outside of the trout. If you desire, you can also stuff the inside cavity of the trout with lemons or lime slices. When ready to grill, preheat your barbecue grill. Place prepared trout packets onto your preheated grill with indirect heat.