He is right ,the dogs genetics don't change with age ,but she needs to be of good sound genes all parents and grand parents and great grand parents need to be good dogs to up your chances .me myself like to know the bitch can hunt like her parents ,but some times you have to breed them young such as when an old stud dog is on his last leg .there has been a many of young bitches that have been waited on and died after a hunt and not have ever had any pups ,so there are ups and downs and I would say the ups out weigh the downs .always breed good to good .