I'm super impressed that all your bunnies are living so long!What is your secret?!
Thanks! My first rabbit (we've had four) lived to be 14, so yeah, I tend to have long-lived bunnies. My "youngster" is already about 7. I just follow most of what the House Rabbit Society recommends. They always get unlimited hay, rationed amounts of timothy-hay based pellets, a salad every night, and not much for treats (a bit of carrot or fruit here and there.) I never let 'em get fat, I only bring 'em outside under supervision, and they get plenty of opportunity to spend time hopping around the house. I only take them to the vet if something is wrong, but if something is wrong, I don't hesitate to take them to the vet. Pretty basic stuff.
Also, ours is generally a quiet, low-stress home, no kids or dogs, not a lot of noise. Perfect for rabbits.