I have a 12-year old hen. Her "friend" since birth died over 3 years ago and I got an 1-yr old chicken for her at that time. They fought for a few weeks but then have been fine together these past 3 years. The younger one, never layed an egg, while my 12-yr old has continued to lay eggs. However, the young one died today. I really don't want to get another hen for her, given her age, but how long will it take for her to get used to living alone. She has full run of my backyard during the day.