Our rabbit savvy vet told us that Flemish giants don't tend to live as long around here because many of them come from bad breeders. We found this out the hard way with our first Flemmie. We learned a lot from him. He lived to be about 4 years old but had chronic health issues - especially dental. We gave him a lot of love, attention, proper food, proper hay, did everything right, and still he had health issues. I can't even say out loud how much we spent on him over the course of four years. But, she did say that they can live up to 10 years if they come from a reputable breeder, but even then there are so many things that can happen out of our control. Our female Flemmie only lived to be 2. She had a thymoma that was inoperable and died before they could put her to sleep.