Greyhounds are a healthy breed and their life expectancy is twelve or more years.
Yes, better than most breeds. Greyhounds are very patient dogs, but they don't want to be harmed by a child or by anyone else. They tend to walk away from problems rather than confront them. Of course, like all dogs, Greyhounds have their limits, and no dog should be left unattended with babies or very small children. Greyhounds were bred to be sociable and to work with other Greyhounds when hunting.