This is completely anecdotal, but my brother first taught me to program when I was 5. I definitely didn't practice for 5 hours a day, but kept programming over

This is completely anecdotal, but my brother first taught me to program when I was 5. I definitely didn't practice for 5 hours a day, but kept programming over the years and am a programmer now. I'm a senior programmer but am pretty average in my estimation. I maybe QA test things better than the average programmer but I am not what I'd consider a 10x programmer or anything. I've met programmers who started later in life and are better than I am. Maybe the only benefit I have is that I'm usually decent at architecting systems. With that said, there are plenty of kids who start piano early and never really become virtuosos. It may help to become a genius if you start earlier, but it still seems to be rare.