What is the longest living breed and the longest time an old english bantam has lived?

[oegbantamsftw]

I have a roo and hen his legs look old and he doesnt have flamboyant or pretty decor like some younger roos but man that roo is wise and tough I am pretty proud of him sorry for going off topic but the thing here is i have herd that they could live up to 15 years but some say 5 years anyone have some sold proof on this breed images or time lapse links or photos would be
so awesome man would make my day
hope its 20 yrs