American Equine Insurance Group has just started offering Major Medical & Surgical coverages through age 20 (ages 18-20 are subject to underwriting approval based on the horse's health history), in addition to the Mortality coverage. The rates for Mortality start to increase at age 15. They use lots of different agents, but you can call around to find one who uses them to get a quote.
It's not about the color of the ribbon but the quality of the ride. Having said that, I'd like the blue one please!