No one is too late.
You must change your views however - as you set yourself up for failure by them.
Concert pianists never just decide one day that they'd like to become a concert pianist.
The concert pianist becomes them.
The top performers become such performers by passion, drive, and will to do nothing other.
You must center on this drive, and seek out the best concert pianist and study from them. If you want to become a concert pianist - never study with someone who calls themselves a piano teacher - or that is all that you will become. Study with a concert pianist. Seek them out, wherever the best might be - audition for them, write letters, never give up until you are in their apprenticeship, and then never waiver from attention.
I also doubt top concert pianists would waste time on a forum - so turn off the computer and begin your quest.