How old is your oldest chicken? How old is the oldest one you ever had? Our good old rooster is really slowing down, napping on the job regularly, he is good old guy but I am afraid he is not going to be around too much longer. We don't know his actual age, but my son's don't remember what moms place was like before him. He is many years older than our dog. He is at least a teenager, some where I have a photo of my 24 year old son under 5th grade holding him.