So ... is "adult" something
culturally-based (the environment in which you grow up; the behavioral expectations you learn from those around you?) My suspicion is that this plays a strong part. The dancers of the 1930s-60s were trained in a tough world were you had to "grow up" quickly. You can say the same todayof many of the brilliant and amazingly mature artists coming out of difficult circumstances in Brazil, Cuba, the former Soviet Union, parts of Eastern Europe, etc.
I mean no disrespect, but maybe young dancers growing up in prosperous societies -- in which studios, scholarship possibilities, and so many kinds of physical and mental support are such that earlier dancers could not even have dreamed of them -- lack strong incentives to grow up inside.
Which raises the question of
temperament. I don't mean just HAVING temperament and being able to DISPLAY it, but knowing how to control and use it. I keep thinking of mature people as those who possess ALL the classical temperaments -- sanguinic, melancholic, choleric, and even phlegmatic, though an excess of that might be a disadvantage to a ballet dancer. They can access each -- or re-balance them, within limits -- as the performance requires. As Suzanne Farrell one said in an interview, the dancer is a "servant of the choreographer and the composer,
but I am also me."
In that interview, Farrell also said: "I'm a a big card player, you know. And whatever the hand I'm dealt,
I play for blood." This was well into her career. But I suspect that the feeling was already there very early on.
Wanting to be the star is common among the young nowadays. Knowing all the things you have to do in order to BECOME a star is less so.
A final thought (with apologies for rambling) -- Earlier in this thead, papeetepatrick praised the maturity NYCB dancer Sara Mearns. In today's NY Times, Alistair Macaulay, who hates and apparently avoids Peter Martins' production of Swan Lake as much as possible, writes that
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Ms. Mearns's performance of the famous double role [Odette/Odile] is the finest I have seen in about 20 years (since the Kirov ballerina Altynai Asylmuratova).
It's a detailed review, but I was struck by the following statement, which seems quite relevant to our topic.
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Her Odette is a woman ...