If you think about it, Johnnie Handsome sired over 60 Champions in the US alone.....I don't think he was retired at a young age.
I wouldn't start using a Sire at 6. Buy, I wouldn't hesitate using him past 6, as long as his sperm was strong and he was healthy. My concern would be using a girl past 5, too many things can go wrong.....Think about it, if canine years are 7 to every 1 that would make her 35. And if she's whelped previous litters, her reproductive organs aren't as they were when she whelped her first litter.
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