My mother swears that I was skiing before I could walk. Whether or not this is true is debatable, but I can tell you I was learning to ski before I was five years old. At my families favorite Vermont ski resort, I was enrolled in ski instruction from a very early age, and this allowed me to learn to ski and allowed my parents to ski enjoy their ski vacation.
Ski instruction is useful at any age. Even adults will benefit from instruction. As an experienced skier, I have tried to teach friends to ski to no avail. It takes a qualified ski instructor to patiently take a beginner skier to the next level.