Hi,
Thats a tough call at that age. My 5-1/2 year old yellow lab tore his ACL last fall and we had the surgery done the day before Thanksgiving. It was a no brainer at his age and he loves to pheasant hunt.
Its a long process post surgery, but it was well worth getting the surgery done…. (though very expensive). He is running and jumping around now with no problems at all. The surgeon did warn us though, that within a year, the other leg has a good chance of tearing also. we are crossing our fingers.
You will get alot of opinions on whether to have the surgery done or not (due to the age of your dog), but in our case, we are glad that we did it.