I have an older hen that has been wheezing and coughing for over several years
Other then, she is active, eats well, good body weight and no other symptoms
she appears happy and healthy, running around the yard, catching bugs, running after blueberries, and dust bathing. Her feathers are fluffy, body is robust
Sounds like she's doing pretty good at 9 1/2 years old!she has always had a saggy crop, not sure if it cause these symptoms
If she's been having the wheezing and coughing for a couple of years, likely it's nothing too serious.
You mention her crop has always been saggy. If you can get some photos of her and her crop as she stands, that may prove helpful.
To me it sounds like she has a Pendulous Crop. Some folks put a Crop Bra on a hen that has a saggy crop, but if she's managed this long, I would wonder if a bra would stress her and not be that beneficial.
I certainly wouldn't start soaking her or doing anything drastic, she's sounds quite robust and active.
I'll tag in @azygous to see what her thoughts are.
eyes are bright, no discharge from the nose either. She is 9 ½ years old, lays about 4 eggs a month...Any ideas?