My old bunny smokey was around 7 years when she passed away. Pretty good considering she never got hay, only occasionaly got vegetables and was an outside bunny. I was very young when we had her and didn't know practically anything about rabbits. I was the main care giver for her (Like I said, I was very young) so I feel bad that she missed out due to my lack of knowledge. Even though she was an outdoor bunny, she was very loved and got plenty of attention and love from me. She was very healthy and I never once took her to the vet her whole 7 years (around, I don't know her exact age because I can only estimate when she died and when I got her).
My oldest girl now is Pepsi, who is almost two.