We will go with one of the manufacturer’s recommendations for this answer. They claim that these toilet locks should be used in place until the child reaches about six-years-old. Of course, this is highly dependent on the individual child that you are trying to protect. If the child does not take an interest in accessing the toilet for play reasons, then they can be removed much sooner. However, some children may still have issues with toilets after the age of six but is usually under this age when these safety locks are needed most.