My BO (Peach) is 11yrs. She is heavy and slow with arthritis and couldn't make the jumps needed to get to her favorite roost. My hubs (a prince in disguise) put extra bricks and 2×4 steps all around the coop and run to make it doable for Peach. She's doing great now and has even laid some eggs the past couple months, over half dozen. Pretty good for an old girl.
Monkey, my first EE, is the same age, also laying a few eggs, and doing great. She is a heavy big EE, but still gets around pretty good.
I hope Buffy gets better. They sure are sweet hens.