Most start quite young, around 15.. however, a jockey must be at least 16 years old before he or she is eligible for a jockey's license. The age varies. However, I think if you are interested and are in good shape you could race in your 20, 30, even 40's.
If you can meet the requirements and have the passion to be a jockey the for sure go for it. Keep in mind, Jockeys are not subject to height limits only weight limits. A rider can be of any height if he or she still can make the assigned weight, but it is generally limited to fairly short individuals because of the limits on a person's body.
The average jockey has a light but athletic build, and body weight is anywhere between 108 to 118 pounds. The weight assigned for the Kentucky Derby is 126 pounds (including jockey's body weight and equipment). Jockeys typically range from about 4'10" to 5'6" in height.
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