I have processed an 8 or 9 year old like ya would a 18 month old steer. Was very happy with it.
If the animal has been in good condition its whole life, it should be a pleasant eating experience. Give some corn thr last month to enhance flavor.
Older animals have a stronger beef flavor.
Personally. I like it. And am finding my customers like it too.
Have to be fat their whole lives though. Could be beautiful Ribeyes.
It's also a genetics thing too. Some animals are just tough, no matter the age or sex.
A good butcher should be able to tell you what to do with it when they start cutting into it.
Old thread or not, interesting topic.