People looking for older, experienced, safe, horses "with many years ahead", may be asking for the moon. A good babysitter type horse is worth it's weight in gold, but they are often older, and an older horse may *not* have many years left, and if they do, those years may be full of medical needs to keep them going. They may be limited in the amount of riding you can due with them due to arthritis, cushings disease etc., but they may still be worth it due to what they can teach beginners. If you are willing to be a good retirement home for an older horse, you may even be given one in good faith that will be well worth it to you. But expecting the horse to have all the qualities listed, IME is not a realistic expectation. Good luck in your search, and keep an open mind.