OMG, I am so tired of this progidy thing. What kind of reality do you live in, honestly, if you think it is too late to go for a career if you are not on at least grade 8 level at the age of 7??? Or whatever.
You can start late and you can start early in life, you can develop slowly at first or very quickly, and the only thing that matters at the bottom line, is your own commitment and devotion.
If you want to become a concert pianist, then do what it takes, and just have faith. A lof of faith. It is like any other education, you must work, and work with the right things, and listen humbly to advice and critizism from people who want you to develop. If you do that, you will get where you want. If you are not good at certain things today, then put them on your to do-list and work with them, until you are good. Never compare yourself with others.
People who keep on telling themselves "I am a progidy, so I already know everything that is to know" OR "I am too old already, I have no talent, I have not a chance" will not make it. Period. People who have their goals set, and work towards that goal in faith, will probably make it - in this way or in that way, sooner or later, but they will make it.