Which Days of Glory star had their ballet debut at age 10 in the Paris Opera?
Days of Glory (1944 film):  It starred Tamara Toumanova and Gregory Peck (in their feature film debuts). Tamara Toumanova:  A child of exiles in Paris after the Russian Revolution of 1917, she made her debut at the age of 10 at the children's ballet of the Paris Opera.
Tamara Toumanova