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.
Stuff 2 to 3 sprigs of the dill weed into the cavities of the trout and follow with half of the lemon slices. Spray the entire skin of the fish with the butter vegetable oil. Place on rack in the prepared pan. Spread dill sprigs over the skin and top with remaining lemon slices. Sprinkle lightly with paprika. Pour wine down the side of the pan to coat the bottom under the rack. Bake for 25 to 30 minutes.