How old do children have to be to pick who they want to live with?

In many jurisdictions, there is no specific age at which children can unilaterally choose who they want to live with after a divorce or separation. Typically, children's preferences may be considered by the court around the age of 12 or older, but this can vary depending on local laws and the maturity of the child. Ultimately, the court prioritizes the child's best interests when making custody decisions.