Don't be such a total dumbass. Sorry to be so blunt,but you need to hear it and enter the real world. Do you think the reason that Mozart could take flawless dictation of complex works as a child was that his parents were musicians- or that anyone could even learn such an ability in their 30s, as a beginner? Your belief stems solely from hope.
Nobody should be dissuaded from starting music later (for the sake of enjoyment), but to think about it as a career before having even attained basic competence (never mind excellence) is just deluded to the point where a person's mental health would have be seriously brought into question. What the hell leads you to believe that 10 years of hard work magically creates a concert pianist?
If your goal is music itself, go ahead if that's what you want to do (but don't either bank on necessarily earning a penny for your trouble or reaching the level you desire). If your goal is some romanticised ideal of living the life of a concert pianist (above the music itself), you'd be better of fantasising about being a pop star. It's the basically the same fantasy that the cranks who audition for the X-factor have. I think you're drawn to a dream of fame and glory before music itself. If you take the pop-star route, you don't have to waste 10 years putting in hard work before realising that you're never going to achieve such a dream due to having no remarkable talent compared to the competition.
Ah, but you miss my point quite entirely. First of all I'd like to clarify that I never said that I would necessarily be a concert level pianist in 10 years, I say that it takes about 10 years to reach it, give or take a couple. Your so-called prodigies start when they are 4-6 and are suddenly seen in concerts and recitals at 14-16, for some it takes a lot longer than that, and some reach their goals in a shorter period of time.
But I digress. My goal is to strive for perfection until the day I could play in concerts, and then keep on going, be this day in 10 or 30 years from now (or more, for that matter), I don't care. And I'd say that anyone striving to become a concert pianist for the fame and glory has little to do in the business, and that such a person is very likely to fail horribly. The ambition of becoming a concert pianist means you'll have to sacrifice everything in the name of music. Without being settled to live for music and music alone, your ambitions are misguided at best.
I hold no false hopes of surpassing the greatest pianists, or even coming anywhere near them. But my ambition is still to strive for perfection. Do not assume things about people with little to no knowledge about them, it is not only ignorant but rude.
Good day, sir.
PS. To clarify what I mean by ambitions, striving for perfection, dedication, and discipline:
High ambitions will force you to always make your circumstances the best they can be (even if it means sacrificing things in pursuit of them), and rewarding opportunities will present themselves, after that it is up to dedication and discipline to seize the opportunities presented.