Best Tennis Lesson Plan for Adults Many grown-ups disregard tennis as a sport they can't possibly take up since they're too old. Tennis, however, is a popular and enjoyable activity that can be learned by individuals of any age and in any level of physical fitness. Adults may gain a lot from tennis lessons, and it's never too late to start learning the game correctly. We'll dispel the common belief that tennis is just for the young and offer some compelling reasons for adults