Here's what seems like a realistic observation of the times, to me:
mid-thirties to 50's and up, are *really* the point in which "we" want to start paying close attention to musicians in general, including pianists. Perhaps I think this almost solely because of patterns that exist as a wave in how things have gone, but it just seems that's the age-range where, generally, people seriously start to become artists. In a time where we feel kind of luxuriant in our choices of who to listen to, if we are really looking for, say, performances/recordings for the ages, it's going to generally happen later, almost no matter what kind of technical accomplishments have been made before that point. Even mid-thirties seems quite on the young side for somebody to truly, artistically express something that, say, a 50-100+ year old might gain life-insight from and feel they deeply need as listening material in their lives (that would actually be quite a feat). I mean, as an example, it would be like for me to express something within the next few years that somebody like my own role-models would turn to deeply for a kind of experience they might musically, emotionally, spiritually need, in that way, at that time. How many pianists do you truly feel that way about? I feel that way about my role models AND, I feel the sky is the limit in terms of what kinds of expressions they may give to the world as we all progress through the years.
I find it curious that it's precisely at this point where "professional" competitions decide they've already got enough to choose from in the younger players. I actually really just don't understand this, considering various aspects of it all.
Personally, I feel I have more than one piece to play in my life, and probably a bit to sing and compose, but if I had to choose between being a pianist or musician who plays loads of OK and borderline meaningful renditions of stuff that hoards of other people also play well, OR being a pianist who accomplishes a single masterpiece in a way that the music world (and the people within it) truly wouldn't be the same without, despite the clamoring thoughts that say I should want this or that, I think in the end I'd prefer to be the latter. What strikes me is that it seems like nobody knows how a person really gets there, AND, I feel there is little within the broadly "professional" -oriented philosophy that truly supports that kind of ... thinking - it seems, but perhaps I'm wrong.