We always reference kids but very rarely ask their opinion. Our inexperience might be what gives us the ability to teach our elders something, due to the fact that we are not jaded or cynical.
There's no committee that says, 'This is the type of person who can change the world - and you can't.' Realizing that anyone can do it is the first step. The next step is figuring out how you're going to do it.
The traits the word 'childish' addresses are seen so often in adults that we should abolish this age-discriminatory word when it comes to criticizing behavior associated with irresponsibility and irrational thinking.
Success on the front of women's rights will look like a world not only with obvious advances - where no girl is denied access to education, for instance - but also one with more subtle changes in how we regard gender and gender stereotypes.