I have an older chicken, she could be 9-10 years old. In the past couple weeks she stopped getting in the hen house at night. I watched her try to jump in about a week ago but she didn't even get close. Now every night I go out and put her in the henhouse. Today I noticed that her wings are hanging low to the ground. It seems like she feels okay, and she still wants to eat. Does anybody have any idea what could be going on? Sorry, I posted this earlier but got no response. Not sure how to bump the thread so I am reposting with a pic. TIA.