Heart says take it, mind says it wont be an easy transition.
How is it trained? Setters are specialists, does that breed suit you?
If you take her, she will break your heart, she has a couple of good years left, maybe, maybe she is fresh for her years because she hasn’t been out much. But she’s an old girl, she wont change what she does to suit you, and you wont own her, you may be the boss, but she’ll not be yours.
Can you still walk a bit and do you have access to a bit of territory where she can run? Take her.
If you dont have a dog, and you want a bit of company, take her.
I’m 70, I have 2 dogs, one 10, one 7 and I have health issues. I’m reluctant to commit to a pup but I’m not sure my current hounds will see me out.
Im fairly sure I wont be around in 10-14 years, but I still have one pup in me, it will be a HPR, (if I was much much older it would be a lab, just cant admit I’m there yet).
Your choice, and best of luck whichever way it goes.