None of my Serama hens are more than a year or so. This one was a younger one in fact. The egg wasn't particularly large either. It was just stuck in the vent. Not sure if she had a lubrication problem or not. I took the egg. I plan to try to remove her tissue from it and see if it hatches. You know, one last effort on her part. I hope it hatches. I just don't like loosing any birds. I try so hard to give them the best I can.