Calming methods on horseback?

[Like a Fox]

If your horse is older then perhaps he has his limitations. What are you getting annoyed about and what are you asking him to do?

As mentioned when something doesn't work, then do something that you know DOES. If your horse is having an off day in the ring, go out in the field for a trot or canter or go for a hack instead and let him chill out. You're also ending a good note which is far better than on an argument.