Mines getting up there in age too, god I just can't imagine the day I have to put her down. She's so good. Always ready to play, in her mind she's still a puppy, but I can tell she's slowing down. Went out to the lake last week and she didn't want to swim after about 3 or 4 tosses of the stick. Used to be she'd do it for as long I'd keep throwing it. A little stiff too now when she first gets up.
I just keep feeding her the best food there is and remain constantly vigilant when she's outside playing in a new area. No drinking out of puddles or rooting around for something that might taste good like they all like to do. She's always sniffing things.