Depends on the child and who you talk to. Some people/doctors will tell you never to let your child sleep in the same bed as you. Some will tell you to stop at around 1-3.
If the child has a problem such as separation anxiety, then you'll have to work with a professional to help the child.
My third oldest slept with us until he was 5 and then he slept on our bedroom floor until he was 11. He had the worst case of separation anxiety that both of the psychiatrists that we took him to had ever seen.
He finally grew out of it himself.
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