My trail horse, Rosie, is 20 and still going strong. She's built like a tank and will go anywhere I ask.
Hubby's trail horse, Harley, is 7.
Our other horse, Mama Horse, is 21 and only does light trail rides and serves as our "extra" horse if one of the kids in the family wants to go riding with us.
Never approach a bull from the front, a horse from the rear or a fool from any direction.