Children with developmental delays may not stick to these age guides.
If you're worried about anything you should speak to a health professional about it.
The problem of online predators is so widespread that some governments have produced guides on how youths can be protected.
For example, a publication of the Federal Bureau of Investigation (FBI) in the United States warns of individuals who immediately engage in sexually explicit talk.
is an online counselling and support service offering a 24 hour source of help for Wirral's 11 to 25 year olds, with information and links to many different agencies and services.
offers young people an opportunity to access help and support through our online chat room, where young people can drop in and/or book one to one chat sessions with a member of the Kooth team.
If you have access to the Internet, what dangers should you be aware of?
Chat rooms can accommodate large numbers of people, who can read and respond to each other’s messages.
Students may even chat about their class project with a qualified engineer, chemist, or another expert.
Many people who visit chat rooms, though, are not there to discuss academic subjects.
Some chat rooms are particularly appealing to youthful Internet users.
Millions of young people from a variety of cultures exchange opinions daily on almost any subject. For example, with their teacher’s supervision, students in the United States might discuss social issues with fellow students in Spain, England, or elsewhere.