I guess it depends on what "experience" you want them "experienced" in. (does that make sense?) For example, myself. I am/was (getting out of it) a breeder. I have dealt with many types of horses. I have handled a stallion. I know about the care of the horse, medical knowledge for basic injuries, and feel I can "talk" intelligently about horses to others and can even teach some people a few things. I have owned many horses (as many as 24 at a time) working with several breeds. I have rescued approx 20 horses in the last 5 years or so. (could be longer, I dont count the years any longer. lol). I can start foals with the right foundation, and have "started" many horses starting with ground work and ending with backing them and getting them to walk, trot and lope. The "backing" training is with conjuction with my adult daughter who is WAAY more of a horsewoman than I am. But, as a rider, I still consider myself an "advanced beginner". I can ride most calm horses and a few more spirited ones. I don't panic (at least try not to) in a scary situation. But there are many, many more who are MUCH more experienced riders than I am. I wouldn't DREAM of giving lessons.
There are others who can ride wonderfully, but don't know basic horse care.
I don't think owning one horse for 2 years is enough experience. I don't think even owning 10 horses for many years count. How many idiots out there "own" horses and all they do is throw them out in a pasture and feed them occasionally.
To sum it all up. I guess I want to say, that to be a "horseperson" (in my book anyway) you must be a well rounded knowledgeable person with at least 5 or more years experience dealing with MANY aspects of horse riding and care. In other words, if you take any one or two things on that list, isn't enough. But if you can do many, if not most of the things on the list you are closer to being a horseperson. Except for the riding 5 crazy horses. That just IMO shows your lack of intelligence.