I am fond of depicting the lives of young folks for one thing, and if you have parts for girls or young men, you must absolutely have young people to fill them - that is generally acknowledged now.
Now supposing I had the part of a young woman to give out, one that wanted some excellent acting. If I were to go to the stage for my actress I would have to take a matured woman, one who would act splendidly, but who would look too old for the requirements.