I started when I was 10, but I didn't get seriously into programming (like deciding it was going to be a profession) until I was 23. Also had a heavy math focus, though it was more because I enjoyed math than because I knew I wanted to do something that needed math.
There's plenty of time to try things out in high school and college, and it doesn't make sense to specialize until you have a sense of what's out there and what you might enjoy. The world is much, much broader than it seems in high school.
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I started when I was 10, but I didn't get seriously into programming (like deciding it was going to be a profession) until I was 23. Also had a heavy math focus, though it was more because I enjoyed math than because I knew I wanted to do something that needed math.
There's plenty of time to try things out in high school and college, and it doesn't make sense to specialize until you have a sense of what's out there and what you might enjoy. The world is much, much broader than it seems in high school.