How old is too old to breed a male rabbit?

I would like to know so I can have the best future for new bunnies.How old is too old to breed a male rabbit?
You can breed from males alot longer than doe's. He would proberbly like to breed until he dies. But you should retire him approx 2 years before life expectancy. This different for different size/breed. Small breeds live around 4years medium breeds approx 6 yrs and large and giant alot longer.How old is too old to breed a male rabbit?
I have a very small breed male and he is 6 years old. He is neutered which does effect their health in a positive way. I think after 3 years of age they should stop being breed because they are obviously not spayed or neutered and are at higher risk of health problems. Please do a lot of researching before you breed.
Unless you're an experienced shower with good show quality papered stock, birth.