Don't know off hand but I'll see what I can find. I would think that it's true that stillborns and slugs would come with extremes of age. Young as well as older or old if you will. Remember my 7 year old Blue puget and what she went through? Although I think she might have been brumated by the previous owner while she was already gravid. Plus she was a older female. She almost died, but didn't, so I'm hoping she is stronger and healthier now.