Generally speaking, a 14.5 hand horse (approximately 58 inches tall) is considered small for an adult male rider. While some adult men may be able to ride a horse of this size comfortably and safely, it could put strain on the horse's back and joints, especially if the rider is heavy or inexperienced.
For an adult male, a horse that is 15.2 hands (approximately 62 inches tall) or taller is generally more appropriate. This size of horse can better accommodate the weight and height of an average adult male rider, providing a more balanced and comfortable riding experience.
It's important to consult with experienced equestrians, such as riding instructors or trainers, to assess the suitability of a particular horse for an individual rider. They can evaluate both the rider's capabilities and the horse's characteristics to determine whether they are a good match.