If you mean what are the people who have been dancing for a long time and are now the foremost dancers of a company, they are usually called principal dancers.
Ballet
svetlana zakharova
yes
This beautiful woman was a famous ballet dancer with the much acclaimed Ballet Russe, she was the first African American in a major ballet company.
Technique, Grace and strength.
Well, if you are dancing at a Major ballet company (ie. American Ballet Theater) you can be paid at least $100,000 or much, much more a year...
It depends, if you are talking about a ballet class, then it is at a ballet studio. If it is a performance you are talking about, then ballet is danced at a theater. If it is a local unprofessional ballet, then it is obviously at a local theatre. If it is a professional, then it is performed at a theater usually in the same popular city that the ballet company is in. Professional companies also go on tours to other major theaters.
At the New York City Ballet, experienced ballet dancers earn $1,500 per week. Ballet dancers with star status can make $3,000 to $5,000 per performance working for major companies.
Probably fondu, plie, battement and tendu
Not sure off the top of my head, but the major ballet companies are; The Bolshoi, The Kirov, The Moscow Ballet, and The St Petersburg Ballet. Often countries such as Russia have many many little companies that may exist and are supported by the small towns they are in.
You can join a variety of academies at any age, but at major ballet companies, I don't think you can. It's like a 14 year old joining a major company in sales or something. Although, you can probably join the major company's academies. AND there's always a first for everything. :)
American Ballet Theatre, the Pennsylvania Ballet, The Kirov Ballet and the Bolshoi Ballet