Bullshooter, no that's not too old at all. In fact, because your dog is on the hyper side will make him easier to train.

Even for an adult dog, the 10 minute retriever would be a great reference. You basically want to work on retrieving and obedience first. Add in some dead birds and within no time you'll have a bird dog.

You gotta do some training, though. Too often people will take an older dog once hunting and give up because the dog doesn't perform. Eventhough the word "retriever" is at the end of Labrador doesn't mean they'll work without training. Putting in the time to train will result in a working dog.