We have some naughty roosters we have decided to process and eat. How old is "too old" for a rooster to be edible? The oldest one in the group is about a year and a half old, the rest between 7 and 9 months. Now that we are getting more involved in processing and have a better handle on what to do, we are going to process our roosters much younger in the future. It's just that last year's hatches turned out to produce about 80% cockerels.