Unfortunately, there is no magic age at which children develop the maturity and good sense needed to stay alone. Your child should show a desire and willingness to stay alone, should be showing signs of accepting the responsibility, and should be able to make decisions independently. Children who are able to get ready for school on time, solve problems on their own, complete homework and household chores with a minimum of supervision, remember to tell you where they are going and when they will be back are demonstrating some of the skills they need to care for themselves. For many children this is between the ages of 10 and 12.
Several other factors must also enter into your decision. These are: the neighborhood in which you live, the availability of adults nearby, and how long your child will be alone. If you neighborhood is unsafe, if there is no adults nearby to call in case of emergency, or if your child must remain alone for a very long time, it is best to continue to use some form of child care even if your child seems ready to to stay alone.