Can a person under the age of 18 years purchase Insurance products and services?

Can a person under the age of 18 years purchase Insurance products and services?

Vet fee Insurance. 
You must be 18 years of age or older to purchase any insurance policy.
Horse Vet Fees Insurance Terms and Documents

Horsebox, Trailer and Breakdown Insurance 
You must be 18 years of age or older to purchase any insurance policy.

Regards.
HH