Hi
@Gotalotofpetstoo , I've been away for a week, and it sure is good to see Ethel's videos showing her improving mobility. I don't know if you have ever dealt with a blind animal, but I've had two. An elderly dog that gradually went blind, and a hen that was born mostly blind due to cataracts on both eyes. With the old dog, he used my younger dogs as "seeing eye" guides. And my younger dogs somehow understood he needed them as a guide. When I opened the door to let them inside the house, the two younger dogs would brush next to my elderly dog as they ran past, & he would follow them up the steps. IF Ethel will tolerate young pullets, hopefully she can use them as her Her "seeing eyes." Re the blind hen, she lived to age 5 before dying a natural death. (I didnt necropsy to know the cause.) She was unfortunately bullied by some other hens. For that reason I provided her separate housing (a rabbit hutch) to sleep in at night to make sure she got enough to eat. She was still out with other hens during the day. (Only a few bullied her.) If Ethel can overcome everything else she has faced, she will be able to deal with blindness too, even more so if she will accept pullet friends. The main thing is always have her food, water, housing, etc in the same place.
To answer your question about the chick breeds, Rhode Island Reds usually live to at least age 5; I have a RIR hen that recently turned 8 and is going strong. Brown leghorns tend to live longer than white leghorns since they are not quite as high production layers. As stated earlier, black sexlinks are high production layers, and while they may live longer than red sexlinks, the higher egg production will shorten their lives. A hen laying an egg nearly every day is somewhat comparable to a mammal giving birth nearly every year. Most people want high-production layers and not hens that live a long life. But I have quite a lot of hens of various breeds that are now ages 5 and up, and there are many chicken breeds that should live to at least 5. Of course there are no guarantees, and one thing I've learned (and you probably have too) is that when we love a human or animal, we are never ready to see them go.
I saw that azygous helped you a lot this past week. If you don't hear from her soon, tag her to address your tube-feeding questions; she won't mind.