I learned to play the piano without a piano
theguardian.com
theguardian.com
Its not hard/fast, but I think its just a huge leg up
That said, age matters. Very, very few people can start programming at 18 and progress to the top 20% of the field. I can't think of anyone who's done so, though I'm sure there are exceptions.
I didn't "program" either before 18, since I grew up in a household (and part of the country) without any access to computers. But I was indeed drawn to it young, and "learned to program" by reading magazines and sending off for free vendor literature (which did indeed have lots of nuggets of knowledge about all things tech).
Not saying its good, just it may be a resource management issue
Other factors are at play too. Like if you're not making money by playing the piano by early adulthood, you'll be spending your work hours doing something else. Where your "competition" will be playing the piano 24x7.