We have 5 bulls in service: Aged 4 to 12 years old. All of ours are docile and you can walk among them (the're in separate pastures with their girls). They respond to hand signals and verbal commands to "come" or "get back", etc. In our 10 years of having Longhorns have never had a problem with any of them.
On a sidebar, all of our service bulls have been purchased from other breeders. Our own bull calves are sorted at weaning (or before) as to Keep, Hit the Road, Steer, Hamburger. The Keepers are available for sale to others.
If you would like to see the bulls I'm talking about...just go to our website(s).
Welcome to Longhorns!
P.S.: A Caveat: Don't put two breeding age bulls in same pasture (especially if there is a female around); and second, don't get between any bull and a female that is in heat... Third, even though a bull is "predictable and tame", always keep an eye on him when you're in his area. Finally, never make a "pet" out of a bull.