Is 18 too old for a horse?
Most horses are in their best years in the mid teens to mid 20s and can be ridden well into their late 20s or their 30s (some even longer) if well cared for.
Can you train a 20 year old horse?
Older horses who have had positive prior experiences are the easiest ones to train, even if they haven't been ridden or worked with in years. Since they haven't been mishandled, there are no bad habits or associations to overcome.
Is it OK to ride a 20 year old horse?
Assuming the horse is sound and healthy, absolutely. my two best lesson horses are 21 and 22 years old. I've known many lesson programs with horses closer to 30 years old. As long as the horse is healthy and sound, regular exercise is good for them.
Is 18 too old to start horse riding?
Definitely not! The majority of riding schools can accommodate riders of all ages. And there are plenty of reasons why horse riding is a great hobby for children and teenagers.