Join Date: Aug 2006
Location: San Francisco Bay Area
Submit Photo: 5
Photo Submissions 19 Times in 13 Posts
I don't think there is any pat answer. I have two girls that are two years old, and one has a full-length coat in front, and it is pretty long in the back, but her mid-body is still not full length. The other one is still a young adult look. I'd say that by three years old, you're probably going to get all the length the dog will get in the hair.
Various lines (genetics) seem to have varying length & fullness of coat too. If you've seen Hildago (or is it spelled Hidalgo?), he and all of the puppies of his that I've seen have floor-length coats, even dogs a year or younger. And then again, I've seen a few dogs that seem to have a perpetual puppy cut look to them. Their hair just doesn't get down to the floor.
So, that answer was probably no help at all, was it?