Really old ones can get a certain look.
I have a 12 yr old Muscovy female and honestly she doesn’t look old but she has a limp most likely arthritis. That’s so sweet you’ve spent your day with your ducks do you plan on keeping yours cooped up during the hurricane if it comes your way? In 2004 2 hurricanes about a week apart came up through the gulf and up into Our part of NC we had severe flooding our river was around 20’ above flood stage. There were 2 Muscovy drakes that had been living in the river for about 2 months I had made friends with them. When the rains started I was sick with worry that they would get washed down river and get separated or drowned. The next day we went looking for them they did get separated but actually stayed right down below the house how I have no idea unless they came up on the bank close to our dirt road but I’ll never know. Any way they made it through that storm. We didn’t of course have hurricane winds but that is some of the worst flooding I’ve ever seen around here. Matter of fact someone’s goat got washed down river and ended up in a maple tree right along the river about 15’ above the ground. We thought it was a deer at first my husband climbed the tree and got it down that’s when we knew it was a goat.
I think that is a great plan and you are awesome to care enough to do this. We’re praying for everyone’s safety.