Unless you live either on a mountain top or the dark side of the moon, you would find it impossible to stop kids of whatever age having access to the media, in whatever form, and from being influenced, in some way, by it.
Children are of course the most impressionable members of society because they are learning about all kinds of facets of life as they grow and mature. Influences, good and bad, are inescapable for them.
As long as they have a strong family unit around them, then the chances are that they will probably be taught social graces, what's regarded as right or wrong, what's acceptable or what's not, and so on.
The worst way, though, to thwart a child's development is surely to "wrap them in cotton wool" by shielding them from the world around them. It's the responsibility of parents and adults to come up with the answers and example when children need questions, of any description, addressed.
Vigilance and common sense approach has to be the answer.