How old do you need to be to become an actor or actress?

Anyone at any age can be an actress I think but that is my personal views.Well just look up some famous actresses or actors around the world on websites like International Movie Data Base(www.imdb.com).Go to their biographies and find out how old they were when they did their first movie.I figure out their age by taking what year they were born in and taking the year of their first movie and subtracting really helps.But they are a big variety in age for them. Hope that helps, well i think shirley temple was 5 when she started but fro some reson she stoped so yah hoped it helped.