How fast did you decide on what job you want in life?

For example, my journey to product marketing has been a long one. Since I was 21, I knew I'd love to do some kind of strategic marketing in the future, but no one at university told me which marketing jobs exist out there and how they're all different. It was not until 25 that I first heard about product marketing and realized that it's what I've been looking for. How early in life did you realize what you want to do professionally?