I have a Cochin bantam frizzle hen who is 7yrs old she is my oldest. I think it depends on the breed too, my bantam game chickens are my flighty ones I only have 2 roo and hen but I tell ya they are like the jungle fowl they can go out in the woods and forage fly back inside the fence they have great survival skills.Wow! 11 years is old! Our oldest chicken is...4. Taming poultry can be really hard, I know. My birds can be perfectly tame, but if I don't work with them for a few weeks, they get flighty againBut, oh well, I try to make time to hold them anyway