Just wondering . . .

My golden is 14 months old and way bigger than the standards set forth for his breed. He is currently almost 28" tall, shoulder to floor, standing. He is almost 90 lbs, and is actually on the thin side. Needless to say, he will be even bigger when he fills out.

I know different breeds reach their adult size at differents rate. Generally speaking, the bigger the dog, the longer it takes to reach their full size. How much longer do you think Jake will keep growing? I'll love him no matter how big he gets, but it would be nice to know how much more "growing time" I should expect, just so I can be prepared . Any advice would be appreciated.