PERSONAL
In my personal experience as you grow up you start losing innocence from either the people you hang out with, or getting the talk or thing associated with that. But in my personal perspective most people lose their innocence by the people on which they hang out with.With the group of friends that most people hang out with as people get older they start getting curious and they start learning and as they learn they slowly start to loose their own innocence. Losing innocence is a part of growing up because over time weather it be with the people you hang out with or just by overhearing things etc. you will lose your innocence either way because it is a part of life.