By age 15 there are already irreversible changes taking place in your body and even hormone shots will have limited effect in helping you become a Python programmer.
Thankfully there's a homeopathic cure involving triple-distilled spring water vapor that can reverse all these changes and put you right back to your prepubescent cognizance receptive state, but only if you never had a vaccination. That's how I managed to learn Perl. Now I wish I had been vaccinated against Perl.
Seriously, where did this weird ageist meme come from?
A lot of the engineering-types do start young and hold it as a point of pride (heck, I even do it sometimes, regrettably). Some of those people are ---- ****es and are dismissive to other people who didn't start as young (egos are dangerous things). This just means that those early-starter folks are terrible people to work with and not that they're super smart.
The ones who started young aren't necessarily any better, either. I learned more about computer science in 2 years of university than I ever did during my years in middle school (see how I just dropped that age reference in there? I promise not to be a jerk about it).
Some say it takes 10,000 hours of practice to master a skill, but others note that's only if it's 10,000 _good_ hours of practice. Surrounding yourself with motivated and like-minded learners is a fantastic way to accelerate your learning far more than youth ever could.