Definitely too soon to worry. He may have had something else on his mind, and not been actually paying attention to the birds.
My stupid lab KNOWS that ducks fall further than 50 feet, far more often than they don't, but he simply will NOT look for them further than 50 feet away the first few trips out at the start of the season, and he is only 6 this year.
One of the last trips out last year, he went over 400 yards after a cripple, and opening weekend, I had to practically drag him out beyond the 50 foot radius to get him to retrieve a bird that landed on the edge of our decoys. And again several times while jump shooting when the bird landed further than 50 feet away. So NO I don't think your dog has any serious issues at this point.
I think Springers are one of the longer lived breeds (hunting seasons wise) so 9 should not be the end. At a guess I would say he has several more seasons in him, though they may move at a slower pace from this point forward. But then again, maybe not.
Give him a chance.
I am almost POSITIVE that every dog will have an off day from time to time. I keep telling myself that so I don't get so mad at MY dog. :roll: